Eratosthenes: Biography of a Great Thinker

[@mycupoverflows7811]

My kids and I are studying the history of science in our homeschool, and this is a great video to reinforce what we've learned about Eratosthanes! Thanks!

[@Socratica]

Thank you so much for sharing with your kids! We're absolutely tickled. 💜🦉

[@luisvasquez812]

Eratosthenes is really blowing my mind...

[@grongolawless1396]

"Educated people have believed the Earth to be spherical for ages," Wow, roasting all the flat earthers, you're not wrong, but wow

[@laurenodens289]

Dude, anyone who believes the earth is flat is asking for it

[@Heaven_slayzz]

Watching this ten years later in grade 8 and it’s a bop

[@techguy5189]

Why didn't Eratosthenes use the ARC LENGTH formula to calculate the radius of the Earth? 2% of the Circumference of a Circle = 2% * [2*pi*radius] ... The Distance from Alexandria to Syene = 2% * [2*pi*radius] , no?

[@larryscott3982]

Because pi wasn’t well known? Or, the method he used was simpler and not dependent upon pi.

[@mycupoverflows7811]

Archimedes (the man who came up with pi) was his contemporary. It's unclear whether pi was actually known when Eratosthanes measured the circumference. It cracks me up that people like us say "why didn't they just..." when these brilliant thinkers are the ones who GAVE us all the tools we use today. Just goes to show us that there are actually many ways to find information if you're willing to think outside the box. 🤷‍♀️

[@lightseeker7962]

This is why the Greek we so ahead, why their civilization was superior to others back in history. They had the greatest minds there.

[@Ycaru5]

Where's Pythagoras's biography? You should also make one for him. Thanks!

[@rokasodopasqual3201]

Thank you SO much for posting this i was looking for reliable sources for a list of links im making for a friend

[@Jaidebeau]

What did he do as an astronomer?

[@asr9285]

So nice ..... please make video on Humboldt......

[@jmseipp]

Most still believed though that the Earth was flat when in fourteen hundred and ninety two Columbus sailed the Ocean Blue… They thought Columbus was crazy and he’d fall off the ends of the Earth for sure. Columbus’ men were terrified and begged him often to turn the ships around and head home. Was Christopher Columbus aware of Erstothenese?

[@frankbrown7043]

No

[@kunslipper]

thank you so much.

[@HansDunkelberg1]

A great explanation, without unnecessary complicatedness. The background music is directed awfully.

[@LoofaOfDoom]

what part of this was complicated?

[@HansDunkelberg1]

@@LoofaOfDoom At 1:31, the speaker formulates: "From the length of the shadow, Eratosthenes concluded that Alexandria and Syene were one fifthiest of a circle apart. So he multiplied the distance between the two cities by fifty, to get the circumference of the Earth." I did not mean to say that any complicatedness had remained, rather that you also _could_ explain such a reasoning with some complicatedness.

[@DrRiq]

Goodness, she's so very pretty.

[@johnlt7026]

I was actually just thinking that.

[@shanemoore8055]

euro-asian women are so pretty

[@bbbeto02]

shane moore There's nothing asian about her though.

[@Konnen-l9h]

@@shanemoore8055 she's Brazilian

[@johnwalker6318]

What kind of flour did Erathanese invent???

[@Joshua-fq9tm]

what? the channel that taught me how to do python programming is also teaching me history?

[@BeginnerDad]

We like the logo of the owl the most! (spoken by 7-year-old)

[@ihsanbajwa3974]

اراتوستھینز ایک یونانی ریاضی دان تھے جنہوں نے زمین کا سائز معلوم کیا تھا ۔۔۔۔

[@christophermyers8157]

What is the oldest book we have that claims Eratosthenes existed? I searched high and low through every history book I had and the internet and can find no verification that Eratosthenes existed, let alone was even written about prior to the 18th century. As far as I know the facts you are purporting about Eratosthenes have no documentation to back them up modern or ancient. I wish someone would tell me where the stories of Eratosthenes came from. Everyone says it is obvious he lived near 240 BC in Greek, but not a single historian has written about him until well into the 18th century. Couple that with no original documents, just historians claiming he existed but not referencing any source material that they actual read to come to that conclusion. Sure looks like Eratosthenes is a modern invention of recent history rather than a real character from ancient history.

[@PublicUniverse]

He is cited in "Introduction to arithmetic" by Nicomedes ~200BC. Cited in "On the Circular Motions of the Celestial Bodies"- Cleomedes ~100AD. Cited by Theon of Smyrna. Cited by Pappus of Alexandria. There also is a letter to Ptolemy on duplication of Cubes which still exists.

[@lonermrvedits8754]

i think Mozart's symphony is copyrighted

[@Socratica]

Thanks for your concern, kind friend! We pay a fee to use licensed music. This is one of the costs of making high quality videos on KZbin - and one of the great things our Patrons on Patreon make possible! Share this link to help: www.patreon.com/socratica

[@neinundnein6358]

Your topics are well selected and well documented for the chosen length of your clip. I only find it irritating, wenn amateur science-videos are too quick, too quirly! Science topics are not to be presented like gags or quirrly jiggles, I think. Those things are meant for anyone and would be easily understood by anyone. The consumers have no problems with understanding the meaning. But in watching science videos people have different basics: some know the topics, and for them the videos are anyway rather boring, and they wish for something else. Those who don't know or only partially know the topics, whish to understand it, and for that purpose it is always better to speak a little slower. At least, that's how it is with me: If I know those things already, I'm not so interested to hear them again and again. If I don't know or only partially know them, I want to understand them without having to scroll all the time backwards... But all in all your viedos are lovely and thumb up for them! One should make subtitles in other languages to them!

[@lizzieasher2268]

I really love henry cavendish!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@lizzieasher2268]

OMGGGGG18 OMG DANG

[@kirbymarchbarcena]

She'll easily outclass him...

[@asr9285]

Ur art of speach is awesome .....Allah had created u with great anchor art

[@LiveSounds11]

Using only cleverness?...lol. what about the library books he had access to? using Kemetic (egyptian) tools Tekken (obelisk)... head librarian

[@cyizarwanda5488]

Just like that, an African with a Greek name, found out that it was round!

[@user-Prometheus]

Eratosthenes was Greek.

[@user-Prometheus]

@Sun Light It’s called a colony, assclown. You don’t call Archimedes Italian because he was born in Sicily, or Homer Turkish because he was born in what is now Izmir.