A brief History of the Calendar and Time Keeping

Tuesday 23 February, 20h00 • Aula Minderbroedersberg 4-6 • Dr. Donna Carroll, Lecturer of Physics, Maastricht University
How many times a day do you check your calendar or look at your clock? These days our lives are driven by deadlines, schedules and timetables. Time and its many divisions (hours, days, weeks, months, and years) have completely shaped our lives and yet we seldom take the time to consider how these concepts arose.
The calendar is inextricably linked to the mechanics of our solar system, and the way in which we describe our periods of time has arisen from ancient speculation in astronomy, mathematics and religion.
In this talk, Donna Carroll will provide a brief history of our calendar and an introduction to time measurement. A fascinating field where astronomy, astrology, mathematics, politics, agriculture, superstition and religion all come together.
For more information please visit:
SG Maastricht: www.sg.unimaas.nl/
Talkin'Business: www.talkinbusiness.nl/
University Maastricht: www.maastrichtuniversity.nl/

[@nathanharrison2069]

If only all Physicists, and other experts, could explain complicated subjects so effortlessly, precisely and interestingly we would all be a lot smarter. Thank you!

[@kevincarothers7486]

This is fantastic and so informative.... MUCH better than most TED talks IMO.

[@cedricgist7614]

I shouldn't be surprised that a physicist would give an hour-long presentation on calendars and measuring time - but I am. I shouldn't be surprised that the physicist was a female as youthful as a teenager - but I am. I am not surprised that she did a damn good job. I searched for a video that would cover this topic and I was not disappointed.

[@DoReMi123acb]

I am proud to say I search for this! Was finishing my afternoon hospital shift and it just came to me to find out history of telling time.

[@jamesgurney6576]

This is one of most interesting lecture, explanations of calendars/ time I have ever listened too. I have studied Astro Navigation and learned about lunar , sidereal solar time before, but I wish this lecture was available back in Navigation classes. This lecture gives a fresher deeper insight and appreciation of time and calendars. I am watching for my third time.

[@oumerseid8180]

So cool. Never take things for granted in all aspects of life. What we take as simple and trivial has taken thousands of years and lifetime work of many many people

[@jamesgurney6576]

as a marine navigator and use the sextant years ago, where time was very important. I enjoyed your lecture - A brief History of the Calendar and Time Keeping. When involved in fisheries patrol and having to go on the witness stand, i can not forget the strange looks from the judges and Lawyers when explaining different times from GMT to Newfoundland time to Atlantic time time zone and then telling about time diffenence as it involve Loran C units ( which had nothing to do with zone or mean time ). Anyway thank you for posting the lecture on KZbin.

[@Azure_Zahab_Truth_Zealot]

I've been studying calendars for many years and can verify nearly everything she has shared. Excellent work! Thank you!

[@Azure_Zahab_Truth_Zealot]

There is another way of keeping time that you did not mention, likely because it was obly recently rediscovered... The True Clock and Calendar of YaHUaH. יהוה Spica=Abib... Fully restored or full moon for beginning of months. Days starting with dawn and ending in the esrly morning before dawn... With a star or cluster heralding in the appointed times of יהוה. The mark of the beast keeps y'all away from the Truth, because it is a tool of control... Like language.

[@Azure_Zahab_Truth_Zealot]

Bet you also didn't know how on the last evening of the moon cycle the sun will set then the moon 🌕 rises from the East, next, the "moon rules the night with the stars" and sets as the sun dawns greeting each other in the morning sky marking a "new month day". This system also uses a 13th moon cycle like the Macedonians, as stated throughout Scripture and historically with historians like Josephus. I'm surprised that this "expert" doesn't know this, not did she tell us how some Nations used the full moon cycle, only the wicked nations like the Babylonians/Assyrians/Greeks/Romans used a crescent 🌙 to start the months.

[@josephrikers1111]

A little here a little there beware neuralink out there lurking at short and long distance quantum computers quantum physics the power exerted by cern assisted by five g and starlink passing an emp like a touchdown from a QB simultaneously mutating algorithms Ask any emt in how long the brain begins to die with no pulse inside it’s not hard to see if the world had a blackout like India in two thousand twelve and and in the United States north East in two thousand three we don’t get up like powerlines cables and electrical appliances end game for you and me

[@Azure_Zahab_Truth_Zealot]

@@josephrikers1111 "no weapon formed against me will prosper"

[@MyChihuahua]

@@Azure_Zahab_Truth_Zealot have you been reading my mind?? 😀 don't find hardly anyone that comprehends all of that, as a system.

[@carlagoncalves531]

WOW such a good presentation and speaker! Thanks so much for posting this for everyone.

[@zaratecharles68]

Thank you Donna. I've been searching for Yahs appointed times and led me to you. I know you will be of Great help to me. Glory to the Almighty.

[@MyChihuahua]

Yes, she certainly covers a lot here. You may be interested in the calendar study presentation on my page. Scriptural based calendar found in the heavenly scroll/clock. 😍 Please comment your insights there when you watch. Shalom!

[@svendgalli4808]

One of the best lecturers in the history of the world! I sincerely mean that!

[@SoulCoach]

A truly wonderful and very worthwhile… And may I add, a very excellent presentation

[@MiringuKamau]

This is a brilliant piece of presentation by a beautiful lecturer! I was a student of Philosophy at the University of Nairobi class of 2001. I sometimes will google content related to time and space and I am extremely glad to have landed on this lecture. I live and work in Nairobi, Kenya (East Africa). Good Work Dr. Carroll!

[@christianleon1475]

Amazing lecture rich with information! Thanks Dr. Carroll for putting all this knowledge together and presenting it in such and organized and articulated matter!

[@keepthefaith2923]

great talk. very informative and educational i thoroughly enjoyed it and was glued the whole way through. even shared with my older two children as I know they will appreciate it as much as i did. I thoroughly recommend 👍🏼👍🏼👍🏼

[@YelenaIzKislovodska]

such an outstanding lecture! thank you for sharing with us common viewers!!!

[@krishnasrinivasan7541]

Wonderful presentation. Thank you very much!

[@CeeNstars]

Commenting to say I was just up and randomly started researching calendars. Came across this gem. And because I'm very woo woo I think its cool this was recorded in February six years ago. Thanks for this really cool info to feed my late night randomness 🥰☺

[@Manjinkendo]

This should be good. This is a fascinating topic that is seldom explored explicitly.

[@CapstoneTheMagician]

I absolutely loved this lecture! So interesting and entertaining. I learned a lot. Thanks Donna!

[@atiferede7226]

This is the best public lecture on historical perspective of time! Fascinating. Thank you professor Carroll.

[@jkimball6549]

Donna Carroll is wonderful. Truly enjoyed this.

[@beaucarpenter4688]

Awesome video! Good job explaining everything.

[@toomuchnoyz]

The best explanation of time and calendars I've seen... Thank you.

[@d.rothangidtei]

baseless

[@evy684]

I know this is an old video. But, it is so fascinating ! Excellent presentation.

[@SirCharles12357]

Fantastic presentation. Dr. Carroll is a fantastic presenter. Wonderful lecture, but wished I had more control over it. Can't jump back to relisten to portions of it. Please consider this in future posts.

[@michaelgilbert5876]

absolutely, thanks for this presentation.

[@jadenephrite]

Regarding 47:00, John Harrison invented the Marine Chronometer in 1761 which could determine longitude around the globe. British Captain James Cook used a John Harrison Marine Chronometer during his sea voyages of circumnavigation. Regarding 53:31, the small pocket on jeans trousers was designed to originally store a pocket watch, because pocket watches were worn by men during the 19th century. Later wrist watches superseded pocket watches and the pocket watch pocket could be used to store coins or keys, etc.

[@jonathanfrancoeur2036]

28:16 brilliant! Thank you. The planets for week days. I love it.

[@Pbro1000]

Awesome study, I need more. Thank you.

[@rodrigoromero2166]

very good presentation, complete and enlightening.

[@maxime9636]

Thank U so much 💓👍⏳⌚⏲️⏱️🕗🌒🌞

[@seagypsiesbellydancers3047]

Sounds very complicated, amazing how this was all sorted out , thank you for this lecture x

[@thegangsduo]

Magnificent presentation !

[@jamessteadman1328]

Love the topic and presentation. I need a drink of water now

[@twosongs7396]

Riveting presentation, thank you for posting/sharing it.

[@bryankilvinski]

I really enjoyed this. It was very informative indeed and has so much depth of knowledge :)

[@duncanmarks1590]

excellent presentation

[@locsei105]

Very nice and informative lecture. Thanks 😊!

[@bannaegypt]

Amazing lecture. Thank you very much.

[@ginomatusasiamen8336]

Me who used this video just to listen and clean my room at the same time for one hour 😐😐

[@morpheus1717]

excellent choice

[@surajrshetty]

Thanks ! I always wondered from where week came from. Fyi the babylon system of assigning planets to each hour is still in use in hora astrology practiced in India.

[@tomference4618]

..absolutely brilliant lecture!

[@comic4relief]

The real second, or what one might call a natural second, is still 1/86400th of a day, and is a tiny bit longer than an Atomic Time second.

[@newplanman9836]

Inciteful. Spurns interest for further research. Thank you. She's quite charming...could unconfuse me about physics any day.

[@OyaRevolutionary]

Idiot!

[@brianfuller5868]

Very informative.

[@anthonykago4428]

very informative lecture thanks!

[@chrisg3030]

One natural cycle which I've never seen mentioned in histories of time keeping is the tidal cycle. Yet tides too need to be logged and kept track of in order to make decisions, particularly of course when to enter or leave port, with reference not only to water depth but also flow speed. To this day there's a rule of thumb called the "rule of twelths" used by mariners for this purpose, but I suggest that the convention of dividing clock faces into twelve segments originates with the convenient properties of this number in logging and therefore predicting rise and fall in water height and speed. 1 o'clock tells you that 1/12 of the tidal range (whether spring or neap) has been reached, 2 o'clock that another 2/12's has been added, then 3/12's more at 3 and again at 4. By 5 only another 2/12's, so speed is diminishing, and by 6 only another 1, at which time we have high water and slack water, and the process then goes into reverse over the next 6 hours. The changes in flow speed are represented by the sequence 1 2 3 3 2 1, which sums to 12, and at 6 the water is twice as deep as it was at 3. I don't think other numbers fit as well here as 12 does, except possibly 6, and of course integer multiples of 12. One difficulty that's often associated with using sundials is the inconvenient daylight time length changes over the year, but the tide goes in and out over the same period at a given spot on the coast or tidal river bank throughout the year, maintaining the time length of the hour unit, even though the range changes from spring to neap with the lunar cycle. Moreover, the period between spring and neap tides is roughly 7 days, which might have been the origin of another conventional time unit, the week. If ancient maritime and trading civilisations developed astronomy for navigation, they might have invented this means of time logging too.

[@Ilham-mw7lc]

It is mentioned briefly at around 4:23

[@chrisg3030]

@@Ilham-mw7lc Yes, I guess the flooding of the Nile can be seen as a kind of annual high tide instead of a diurnal or semi-diurnal one. Is/was there a corresponding annual low tide? Dividing this cycle into 12ths could have the same advantages as for seashore tides.

[@QuaaludeCharlie]

Time is the Motion of Objects in a given area of Space in Our Vacuum Under the firmament subject to Decay . The Sky is a Clock . Time is the Result of Observation of Biological Life , Like persistence of a Heartbeat , It's a Love beat , and when we Meet , It's a Good Vibration :) QC

[@rodrigodezubiria2007]

What a fantastic and brilliant lecture

[@SavageBear_YT]

This was awesome, thank you. I've taken notes

[@balreddy2000]

The Roman calendar appears so unscientific. The high priests practically dictated the terms to the ignorant masses.

[@pauleckersley6132]

If we didnt need time n motion for modern society it wouldnt matter to ordinary folks. They live, they love, they work n they die. Just like you dont need to know about building a car they wouldnt need to know what year it was. Just agricultural seasons would be important to everyone.

[@DoReMi123acb]

yeah....no perfect system or practice started off perfect. Also, seems a little silly to be criticizing the ancients with the benefit of modernity.

[@nkmahale]

There is nothing scientific about calendar. It is just matter of convenience. George Eastman's 13 month Calendar would be most convenient of them all provided it most people use it. George Eastman did use it intra Kodak company when he was alive. But convenience is lost if most people don't use it.

[@josephrikers1111]

A little here a little there beware neuralink out there lurking at short and long distance quantum computers quantum physics the power exerted by cern assisted by five g and starlink passing an emp like a touchdown from a QB simultaneously mutating algorithms Ask any emt in how long the brain begins to die with no pulse inside it’s not hard to see if the world had a blackout like India in two thousand twelve and and in the United States north East in two thousand three we don’t get up like powerlines cables and electrical appliances end game for you and me

[@wasifjalal6965]

Great talk thanks

[@drilldrulus1235]

Great example How a consept evolv over time and gets better and better

[@baslielalene4702]

Thank you.

[@margueridepoirier426]

Thank you for this lecture :) I loved it! I just would like to see the images authors mentioned on them. A good day to everyone :)

[@PMJRobertsonHD5]

This was so worth it. Thanks.

[@CaptJackAubreyOfTheRoyalNavy]

The fact that we still use September/October/etc., but for the months 9-12, just goes to show how much humans have a habit for hacking systems together on top of older, flawed systems. We do this everywhere if you look hard enough.

[@balreddy2000]

If Science was understood to become important around 450 AD, it was too late to realise it. On the contrary, the Eastern calendars that originated in India for almost 1000s of years earlier were very scientific with absolutely no selfish names to months or weeks. The world needs to know that every name was associated with nature and every year in a cycle of 60 years also have unique names.

[@santhoshsurya72]

Many were copy of roman calenders.

[@ramuntshiwindstonenndavhel9904]

Wow - Thank you From South Africa

[@treytounkara4578]

I have watched this more than I can I can remember. I knew about the calendar back untill Gregory times but now it's refreshing to go far back as to it's origin. The first king of Rome kingdom in 731BC.

[@yadisfhaddad722]

Incredible presentation! Now I feel like I'm accidentally dropped in a random location in a space rock that wobbles at irregular intervals around a fire rock, and that every order ever percieved by my senses is but a mere illusion.

[@joshsmith8066]

Almost every single experience you and I have today is an illusion (an idea) created by other humans hundreds or thousands of years ago. Every single human concept or idea that we experience today is based on past failed attempts to give order to completely chaotic systems in nature. So technically you and I currently live in a simulation of reality because "reality" as we now know it is almost entirely based on human concepts and ideas. Time is an illusion, but so is everything else. (tl;dr) We live in the matrix bro.

[@meme3954]

I have a question since you are a physics field. Why does my satellite clock and my manual car clock have to adjusted to match the time on my cell phone. This has be a reoccurring problem for years

[@iamkotutu9512]

Currently studying gematria and heard it mentioned that the gregorian calendar was created to also fit the language of numerology. Your excellent lecture gave me deeper clarity into the way the Romans would also count backwards, which is a used cipher within gematria. So interesting, especially as its still being used today by the Society of Jesus and freemasonry.

[@Azure_Zahab_Truth_Zealot]

The last line being all important.

[@spreckrosekrans667]

Very nice, thanks.

[@kamion53]

the Romulus calander was actually a set of dates for activities such as when marketdays were held, when the Senate could gather or not and more. in wintertime there just were no activities , so no calender was needed in that time of the year. The Early Romans probably kept tally of the days that had past, the start of the years did not drop out of nowhere, but it still was a political decision to let the year start. The Pontifex Maximus or upper priest had great authority about it. It was bcause Ceasar was Pontifex Maximus ( and gained more power) in the capacity of P.M. he could reform the Roman calender.

[@cr4zyg3n36]

Michelson & Moreley Experiment clearly proves we do not move !

[@Hadrian1616]

A 'brief' history? Triple like smash.

[@richardschiller7803]

not really correct to say they didn't have fractions. No they didn't have decimal-fractions (0.75) , but they did have whole number fractions such a 3/4 means 3 divided by 4, is three-quarter, 3 of 4. They prove this when they do things like roll a one-cubit stone radius to get length that we then think was a ruler of pi.

[@Marcotonio]

I have two questions. 1) Why are there 13 days marked as "XVIII Kal." in her Roman Calendar example? 2) According to her, the offset is: - 11 minutes (appx.) every 4 years; - A day has 1440 minutes; - It'd take 130,90 leaps (523 years) for the delay to reach 1 day. How could the Gregorian Calendar be 10 days out of synch (and 11 on England 200 years later)? Even if that 11 is an approximation, 10 or 12 minutes wouldn't make such a difference. Am I missing something?

[@oleksiyzaionchkovskyy6091]

just great!

[@michaeljenniferbrabson6263]

I wish you'd have added the qumran-enoch/zadok priestly calendar (derived from Scripture) to your list. Great survey thank you

[@arthurbostic1963]

I don't see that calendar as much different from the solar only Gregorian calendar. Genesis 1:14 explains the Torah principle of two or three witnesses to confirm a matter? And ELOHIYM said, Let there be lights in the expanse of the heavens to divide the day from the night; and let them be for signs, and for appointed feasts, and for days, and years: And let them be for lights in the expanse of the heavens to give light upon the earth: and it was so. And ELOHIYM made את eth-two great lights; את eth-the greater light to rule the day, and את eth-the lesser light to rule the night: he made the stars also. And ELOHIYM set them in the expanse of the heavens to give light upon the earth, And to rule over the day and over the night, and to divide the light from the darkness: and ELOHIYM saw that it was good. And the evening and the morning were the fourth day. BERE'SHIYTH (GENESIS) 1:14-19 את CEPHER

[@sgtpeterson3719]

32:10 what i really wanted to know how did people talk about years before AD BC very interesting lecture

[@meme3954]

I'm glad to see that I'm not the only one that researches for fun. Thank you for mentioning the 8th day that got lost when the Pope assigned Sunday as the day of worship. Nobody mentions that so not many people know the 8th day ever existed. People celebrated twice because people were sticking to ancient traditions. I still believe we are out of alignment. Winner is always later every year in Florida. Winter was November when I was a child. Now it's February March.

[@graceofgodtoday]

Also in FL, and yes, the seasons are changing and shifting a little each year. I have not been able to come up with a calculation for it, but I do believe it has something to do with the calendar changes. We're not tracking years and the seasons of each year properly in the present day and I haven't been able to pinpoint a single cause. It's a mess to unravel!!!

[@phillipjacobson4498]

Wow I'm glad I'm not the only one who spotted this as well. Thought I was crazy! Not global warming? the season is off by calender inaccuracy

[@yahudaughter3160]

Thanks for the truth of lunar calendar . HalleluYah.

[@josephrikers1111]

A little here a little there beware neuralink out there lurking at short and long distance quantum computers quantum physics the power exerted by cern assisted by five g and starlink passing an emp like a touchdown from a QB simultaneously mutating algorithms Ask any emt in how long the brain begins to die with no pulse inside it’s not hard to see if the world had a blackout like India in two thousand twelve and and in the United States north East in two thousand three we don’t get up like powerlines cables and electrical appliances end game for you and me

[@d.rothangidtei]

baseless

[@rayfridley6649]

Daylight savings time idea originated with Benjamin Franklin. It would not be implemented util the twentieth century.

[@meme3954]

I have a physics question for you. If a quarts watch runs on frequencies, and people can have different frequencies depending on the individual wearing the watch. Can the time on quarts watch be effected by the frequency of the person wearing the watch? Does a person's magnetic field or frequency mess with the way they perceive the concept of time. is dragging or time is flying by in a 24 hour period. Always been super curious about it.

[@PhuketWord]

You're right. Time is subjective. If you're curious, look into flat earth and see how the heliocentric model is just a solar calendar. I've just done a video about it.

[@pauleckersley6132]

If we hadnt been adding any extra days for the last 2000 yrs it would now be Nov 2018 in summertime. Glory to God.

[@Ernie_Centofanti]

Good presentation. One item she did not discuss was the adoption of an international date line, and why we have one in the first place. Would be interesting to hear her take on it.

[@michaeljones7465]

The international date line will always have to go somewhere, as these are just lectures, until we bang heads together & devise the best calendar. Ideally it would start around March 21st & have 13 months of 28 days with a new month of Vern/Vernuary slotted in after February. Vern/Vernuary can then be used for leading up to the Vernal Equinox. Leap days can still be added when needed and hopefully we keep February 29th every four years or so, as it's already established!

[@Wheeler63]

Since there are 24 hours per day, it makes sense there are 24 time zones. The date line is where it is because it crosses no land. It does zig zag a bit to achieve this, but very little land in the middle of the Pacific.

[@phacerangu700]

Mind blown! WOW!

[@davidscott4295]

Nature has and always will disrupt man made models. This is the power point I took away from this observational discussion, because anyone who has lived any length of so called time knows that change is a constant, and why models are reformulated at a feeble attempt to compensate for the unknown variables nature puzzles science with.

[@meme3954]

I agree with you David.

[@josephrikers1111]

A little here a little there beware neuralink out there lurking at short and long distance quantum computers quantum physics the power exerted by cern assisted by five g and starlink passing an emp like a touchdown from a QB simultaneously mutating algorithms Ask any emt in how long the brain begins to die with no pulse inside it’s not hard to see if the world had a blackout like India in two thousand twelve and and in the United States north East in two thousand three we don’t get up like powerlines cables and electrical appliances end game for you and me

[@Sconnieification]

Well stated!! Yeah!

[@MyChihuahua]

Man merely attempts to rebel against nature and what 'God' has ordained.

[@seancartenpergatory]

July and August is what set things off from Julius and Augustus January and February were very much the first two months

[@israelomotayo8488]

Thanks a lot.

[@vegahimsa3057]

The Sumerians had equal minutes. Actual one USh was exactly 1° of Earth rotation, almost exactly 4 modern clock minutes. And they divided an USh by six or sixty. Our word "minute" and "second" are primary minutae and secondary minutae.

[@putifinasexy]

What about the Haab calendar?

[@robingore]

fabulous!

[@arbez101]

At time 4:57 How does the height of the nile flood give an indication of the length of a year?

[@Wheeler63]

It would only work if the Nile flooded the same every year and maxed out the same day every year. Not a very good definition of the year. No wonder their empire fell.

[@rapavao]

This is a great lecture! But can someone help me out, did I miss something? On her “Romanized calendar” for February 2016, all the days after VIII Kal. March are VIII Kal. Until the Ides. Shouldn’t they be IX Kal., X Kal., XI Kal., etc.? Did I miss something or is her slide messed up? It happens when she asks the person when their birthday is this month.

[@druishalish]

I saw this too and wondered, but I believe she explained it without saying that's what it was. I know this isn't a great answer to your question, but she speaks to it not aligning.

[@CM-bi6oy]

Lecture had some factual errors. Romulus and Numa are legendary figures who may or may not have existed. So it's far from certain they had anything to do with the Roman calendar. Also, the notion that August had an extra day added to match July is generally believed to be a myth. The seven day cycle named after the first hour's planet was around well before Constantine. Dennis the Small (actually Dionysius Exiguus) did NOT invent the concept of 'BC' and 'AD'. He merely computed a table of Easter dates in which he numbered the years from the nativity of Jesus. It was a later scholar, the Venerable Bede who introduced the 'BC' concept in his historical writings. While it was known that spring equinox was falling several days before March 21 centuries before the Gregorian reform, the statement that it led to Christians being mocked seems a bit much.

[@nepentheanonymous]

C M Good points. Where can we watch *your* video?

[@Byrod1]

nepentewhatever bad point, where can we watch your bad louzy video ?

[@arthurbostic1963]

What is the address to your video, audio, written explanation of the facts about calendation? I am researching the original YAH given calendar of sun, moon and stars from day four of creation and question what parts of YAH's calendar does Judaism, Catholicism, Islam, or Protestant Christianity have correct?

[@josephrikers1111]

A little here a little there beware neuralink out there lurking at short and long distance quantum computers quantum physics the power exerted by cern assisted by five g and starlink passing an emp like a touchdown from a QB simultaneously mutating algorithms Ask any emt in how long the brain begins to die with no pulse inside it’s not hard to see if the world had a blackout like India in two thousand twelve and and in the United States north East in two thousand three we don’t get up like powerlines cables and electrical appliances end game for you and me

[@theelectricorigins846]

Saints celebration in Roman times? It would only happen (though dubious) during AD Christian period. And then they already used a 7 day week (although it was also used an eight day week until Constantine time). Julius Cesar did use a leap year every 3 years! It was Augustus (the next year of the Julian Calendar setting) who modified it to one leap year every 4 years. I think that the subject of name changing from Quintilius to Iuluis was sort of imperial egotism.

[@inishbofinplaces2095]

Nice going. Very well presented. I wonder would a glass of wine have lasted as long as that water though.

[@kotindidestefano3549]

Brilliant

[@isaacisrael8407]

Guess I'm not the only one who noticed that she picks up the cup every now and then and keeps it back again without drinking from it. Lol

[@nkmahale]

I always wondered why December is 10th month. Would have made sense to add two additional months after December rather than before March.

[@glutinousmaximus]

Actually, the calendar we use is the _Roman Catholic_ calendar - or the Gregorian Calendar. The names of some months *are* Roman and 3 weekdays. The rest is a bit of a hodge-podge. en.wikipedia.org/wiki/Gregorian_calendar

[@komlamawuli9294]

Very educative

[@AlbertSchram]

It is an interesting narrative but as a trained historian I have some difficulty accepting Romulus as an existing historical figure. On Roman religion you can read my grandfather's La Religione Romana (G.B. Pighi) supplemented by more modern research.

[@kinggrantking]

So this is a talk given AT Maastricht University in the Netherlands, BY a faculty member of that university, and it's in English? Is this typical of Dutch universities that the lectures are given in English, or is this just a special talk given in English?

[@learnsomethingneweveryday4857]

It is much better to listen in 1.5 speed. Thank you for putting this lecture online . Excellent articulated, girl.

[@darasalam8176]

I didn’t see Celaliye Calendar by Hayyam. His calendar is the most accurate better than Gregorian and Roman calendars

[@MrFreezook]

Do you know why the Great Pyramid is not Purely aligned to North ? Do you know by how much deviation it is ? 111 111 > Strange marking numbers of that Calendar as well ^^^