Sidereal Day vs Solar Day

This video explains the difference between a Sidereal Day and a Solar Day and shows how to prove that the Sidereal Day is shorter than the 24 hour Solar Day by about 4 minutes. Concepts from Trig and Geometry are utilized to prove this.

[annewilliams]

Text and diagrams were not that helpful in other sources.  This video and your explanation made it very clear on this concept.  Thank you so much!

[pratikshukla]

Just Amazing. Even after 7 years it's a lot lot useful to me. Thanks a ton.

[jobranrayyan]

Thanks, Very clear & excellent explanation. But I think there is much easier way to calculate sidereal day: in 1 year the earth makes 366.25 rounds around itself which is 265.25 + 1 (the 1 is because it makes 1 round around the sun). if we divide 365.25/366.25 we have the sidereal day in units of [solar day].

365.25/366.25 = 0.99727 [solar day]
(1-0.99727)*24*60 = 3.93 [minutes] => the difference between solar &sidereal day.. 

[neelkanthbk]

Great demonstration, quite easy to understand.

[Kesodia.]

ohh. Even after 11 years it's a lot lot useful to me

[sanjeebguru]

Thanks for the teaching. I now fully understand.

[curtcoller]

So, today we discuss the difference between solar and sidereal day. So, what is the difference ... and that was enough.
So, I left. So, you can watch it.

[reubensegal]

So how far does earth travel during rotation

[encryptdotwav]

what happens when we divide by the magnetism of the earth as tilts on its axis, and rotation by the orgone energy of the earth?


we are creating pockets, holes in time

[lavampire]

great teacher -- too bad more students did not and do not take advantage of his knowledge. Great physics instructor too. Can teach physics to a crocodile -- that's how good he is.

[JonAhlquist]

Minor pronunciation correction: "sidereal" is not pronounced as "side-REE-ul" (3 syllables), but as 4 syllables: sigh-DEER-ee-ul.

[matiroy]

just skimmed very quickly, but seems to me like the easiest way to do it is simply:
24 hours/day / 365 days * 60 minutes/hours = ~4 minutes

[tinfoilhatter]

so! a sidereal day is 3 minutes and 56 seconds faster than a solar day! but why? because heliocentrism? i ain't buyin' it!

[tinfoilhatter]

so precisely how long is a sidereal day then? why can't you just give us that number?

[tinfoilhatter]

i don't see how you could have complicated this any further, honestly!

[tinfoilhatter]

who cares about the ''center of the earth''? just tell us precisely how long it takes a star to return to its exact same position in the sky, from one day to the next!

[tinfoilhatter]

''about four minutes''? that's far from clear! you don't call yourself a teacher, do you?