Astronomy - Ch. 3: Motion of the Moon (9 of 12) Difference Between Sidereal & Synodic Month

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In this video I will explain the difference between sidereal month and synodic month.

[@zanthoxylum_armatum]

One of the best explanations anyone can find about this topic well done..and thanks

[@KalikoTrapp]

This was really excellent, Michel. Thank you for such a simple explanation!

[@davechurch1661]

the drawing helps. especially with the line up of stars

[@sloanbell9673]

Great explanation Michel! Thank you very much for keeping it short and simple!

[@Noblepilot_abrahamvwi_aeroplan]

Brilliant! Beautiful!! I've never understood it as explained here.

[@MichelvanBiezen]

Glad you enjoyed it!

[@Ben3420]

This video is great! We're just finishing our chapter 3 (The Cycles of the Moon) and I was looking for other videos made by teachers to share with my students. This one is very well done! Just wanted to say thanks.

[@MichelvanBiezen]

Ben, Thanks for letting me know. Have fun teaching astronomy to your students.

[@ahmedalharajin5751]

best explanation seen, all appreciation

[@MichelvanBiezen]

Thank you. Glad you like the videos.

[@ChrisGaviria2]

Excellent demonstration, now I understand the difference which other videos explained in a very complicated way.

[@paolamendez6714]

You are awesome! You explained it very well. Thank you!

[@pranaymathur91]

Sir you are totally awesome. The way you explain the concepts is so comprehensive. Being an astronomy lover, I thank you from the bottom of my heart for making these videos and explaining the concepts in a lucid way🙏

[@sandyv7264]

Very helpful and well explained. Many thanks.

[@himanshushakya2833]

Very helpful, thanks for understanding in very simple language and very simple way. Thanks

[@saraboushi2754]

I was exremely confused until i saw this video. Many thanks!

[@rabulislam2598]

Me too. His explanation was terrific.

[@tapeshvashisth4802]

waoooo........you have explained nicely and made it so easily.....thankyou

[@stephenlaporte7111]

This was beautifully explained! Thank you!

[@MichelvanBiezen]

Glad you enjoyed it!

[@kartikamarjeet2082]

Great explanation, Sir!

[@MichelvanBiezen]

Thank you. Glad you liked it

[@kartikamarjeet2082]

@@MichelvanBiezen 🙂🙂🙂 Welcome, Sir!

[@user-vj2et1ch3r]

You are the best! It really helped me a lot. From Korea.

[@MichelvanBiezen]

Welcome to the channel

[@AceMoreno]

Excellent explanation!, i needed it!

[@sorouppokhrel8670]

Best explanation! Thank you

[@MichelvanBiezen]

Glad you think so!

[@jonathanrichards5024]

Best video on this subject on youtube, gosh everything else was terrible.

[@patrickconnors2215]

YOU ARE AWESOME! THANK YOU!!!!

[@MichelvanBiezen]

Thank you. Glad you like the videos!

[@Morajah]

So well explained! Thank you! Now I understand it :)

[@MichelvanBiezen]

Glad it was helpful!

[@ellier7619]

Perfect! Thanks...

[@Parijatyadav]

great work....great help!!!

[@sarahbrand868]

Thank you so much! This helped me A LOT!!

[@MichelvanBiezen]

Glad it helped!

[@ujwval]

Second explanation that i found on youtube... and this was the first one to clear my doubt. You are a genious sir. So could we call Sidereal month as one revolution of the moon??

[@MichelvanBiezen]

Since "sidereal" time means time relative to the fixed stars, a sidereal month for the Moon means the time the Moon takes to make 1 revolution. The Moon needs to travel a few days farther to go through a complete lunar cycle due to Earth's motion around the Sun.

[@susma8241]

this helped, thank you very much :)

[@hirdayladhyani7572]

You're a great teacher!

[@MichelvanBiezen]

Thank you! 😃

[@upendrakumarshukla-di9zs]

Very nice classes

[@MichelvanBiezen]

Glad you are enjoying the videos! 🙂

[@katherinegeorge8103]

The best explanation I have seen. Thank you so so much!!

[@MichelvanBiezen]

Glad it was helpful!

[@mdkashif2560]

Excellent!

[@MichelvanBiezen]

Glad you liked it!

[@mdkashif2560]

@@MichelvanBiezen Yes, it made the points immediately clear! Thanks! 🙏

[@adbraham]

Excellent explanation; I now get it; thanks!

[@cyan_lord_]

Good clarification.

[@ajmaj5288]

So nicely explained!!! Thanks.

[@MichelvanBiezen]

Glad it was helpful!

[@arianethompson-vandevyver7633]

At last! Got it, thank you very much, very clear

[@MLX-bn1mr]

Very well explained. Thank you very much.

[@satishsativada9232]

I cleared my doubt. thanks a lot

[@jitendradas3776]

Thank you so much sir

[@D_potato_flower]

explendid explanation. Couldnt be more clear than this. Thank you very much for the hard work

[@CarinaPrimaBallerina]

Great explanation. I think I understand it now:)

[@MichelvanBiezen]

Great. Glad it helped!

[@ashutoshsuman9473]

Simple and Beautiful.🙏

[@MichelvanBiezen]

Thanks a lot 😊

[@rubygupta8692]

Cool, Thanks to clear this topic so easily

[@user-sq4dz1pm5q]

Dear Michel I wonder how many thankful comment notifications do you get every day. please share with us. Great videos thanks

[@MichelvanBiezen]

We do have people from around the world writing to us that our videos have helped them with their studies, and we really appreciate this feedback.

[@brindabora2197]

one of the best explanation. thank you so much

[@jamwalprateek]

Good explanation

[@betaorionis2164]

Thanks for the video, Michel. Could we say that the moon should have the same right ascension after exactly one sidereal month? I've tried to check that with several planetary software applications and I don't get exactly the same RA after 27d, 7h, 43m and 11,5s. Is it that the different softwares are not perfect or that I have the concept wrong? Thanks a lot.

[@angelineprospero6584]

Wow! Thank you! Well explained

[@bjornsahlin]

Brilliant, as always Michel!

[@chafaon]

True what they say about a picture & a 1000 words

[@ComputerscienceByMalitha]

wow !! You are a life savvier

[@MichelvanBiezen]

Happy to help

[@dezubiriacarolina1447]

Thank you!

[@MichelvanBiezen]

You're welcome!

[@prabindangwar9709]

Thank u sir😬

[@pvrp93]

thank you for this. was wondering what is the angle between the two earth positions?

[@shhh_neka]

I think it would be about a 30 degree angle. I'm not sure though.

[@MichelvanBiezen]

(360 degrees) x (29.5 days / 365.25 days) = 29.08 degrees

[@pvrp93]

@@MichelvanBiezen thank you for replying, your videos are excellent!

[@salimniroula9473]

Amazing figure explaination sir

[@specialrelativity8222]

thank you.

[@MichelvanBiezen]

You're welcome

[@cotedazure]

Thanks, it finally clicked!

[@MichelvanBiezen]

Glad it did!

[@nasibagahramanova5905]

thanks a lot😍

[@MichelvanBiezen]

You're welcome 😊

[@sa7552]

Amazing sir

[@bimeshbhattarai2864]

Amazing

[@rejiin_723]

Thankyou sir🙏🙏

[@udaypratapsingh7872]

Impressive! 👍🏼

[@MichelvanBiezen]

Thanks!

[@jonathanellis5695]

Hi Mike (or anyone)…does this mean then, that the moon phases are not related to the orbit of the moon around the earth (as the 2 cycles are different lengths of time)?

[@MichelvanBiezen]

The phases are related to the Moon's orbit around the Earth, but the difference between the two "cycles" depend on the relationship between the positions of the Moon, the Earth, and the Sun. The Moon revolves around the Earth in about 27.3 days (sidereal month) while the phases of the Moon are on a 29.5 day cycle. (synodic month)

[@jonathanellis5695]

Thanks Michel. But I’m still confused. As there are typically 13 orbits in a year, and typically 12 new and full moons in a year, then the phases of the moon cannot be due to the orbits. The numbers should match shouldn’t they?

[@MichelvanBiezen]

They should indeed differ by 1 (exactly), because in one year the Earth travels around the Sun once.

[@jonathanellis5695]

I don’t think I’m explaining myself well. I’ll try another question.

[@jonathanellis5695]

Hi Michel thank you for all your work. For the sidereal month, do you mean that the moon returns to the same position relative to the stars when using the same viewing point on earth? For example, in your diagram, the viewing point is the arrow on the earth in the 3 o’clock position.

[@vigneshwark4874]

Thank you sir

[@jaswinderdhaliwal9751]

Awesome man

[@MichelvanBiezen]

Thanks!

[@vijendrapandey298]

Very helpful. Thanks a lot.

[@hananebenselama5503]

This helped! thanks Michel

[@murlecampbell8360]

At 1:28 how many degrees did you say Michel? Thank you...

[@robinspeck3196]

~30 degrees

[@gouti7706]

Thnx ..very helpful

[@elenahobbies9570]

Thanks 👌

[@murlecampbell8360]

How many more degrees beyond 360 would be equal to 2.2 extra days of travel?

[@MichelvanBiezen]

You would have to take into account both the motion of the Earth and the motion of the Moon. The Moon travels about 13.2 degrees per day. But the Earth also travels 0.986 degrees per day.

[@willoughbykrenzteinburg]

As Michel points out, the moon travels about 13.2 degrees per day, so that would be about 29 extra degrees. This makes sense, because in the 27.3 days it takes the moon to orbit the Earth relative to the stars, the Earth (at 0.986 degrees per day) orbits the sun by about 26.9 degrees. It would orbit a little more in the 2.2 days it take the moon to orbit that extra distance. A better way to do this is just to take how many degrees each orbit per day, and figure out how many days pass before they line up again. Knowing that the moon will orbit more than 360 degrees, we know that however far the moon orbits in degrees MINUS 360 should equal the angle the Earth has orbited. We can just use a simple algebraic expression at that point to solve for the number of days until they line up. So : 13.187x - 360 - 0.986x = 0 12.201x = 360 x = 29.5

[@divyanshsingh8245]

loved it so much insane !!!!!.......

[@arpittyagi58]

Thank you Sir ;)

[@MichelvanBiezen]

You're welcome

[@lazesoul9110]

its help me

[@mhdabb9554]

Thanks

[@cinuehernandez2191]

thanks!

[@emmaetheridge8657]

why are some months sidereal and some synodic?

[@MichelvanBiezen]

The months are not tied to either the sidereal of synodic months. Instead the number of days assigned to a month was more related to the importance of the person after which the month was named: August = Augustus July = Julius Caesar

[@lazesoul9110]

thank you

[@gigigem5631]

Thank you!

[@MichelvanBiezen]

You're welcome, glad you liked it. 🙂

[@PavanKumar-nm6gz]

thank you sir