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/sci/ - Science & Math

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1337926 No.1337926 [Reply] [Original]

Why is sidereal day not equal to solar day?

I don't get it.

>> No.1337944 [DELETED] 

please halp

>> No.1337952

Google it, son.

We're talking Earth's rotation respective to the Sun vs.respective to the celestial sphere. Not equal distances so they take different lengths of time to complete.

>> No.1337963

One measures how long it takes for earth to spin once. One measures the interval between the high points of the sun. Different because the earth is spinning on its axis as it travels around the sun.

>> No.1337994

>>1337952
>>1337963
Well, which one is it?

>> No.1337998

>>1337994
They're both the same thing.
You're too stupid to understand so you're too stupid to need to know the answer.

>> No.1338002

>>1337998
They are not the same thing. One is Earth spin vs Heaven spin, the other is Earth spin + movement vs Earth spin without movement.

>> No.1338016

>>1338002
I hope you're not wasting an ability like that.
You should be confusing children for a living.

>> No.1338032

>>1338016
Huh? What do you mean?

>> No.1338101

Listen guys I just want to know the difference. No need for trolling...

>> No.1338212

>>1337926
A sidereal day is (not exactly but simply put) the time it takes the Earth to make a full turn on it's own axis. A solar day is what we experience as a day by observing the sun.

>> No.1338235

>>1338212
And why are those different?

>> No.1338244
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1338244

>>1338235
BECAUSE THE EARTH IS ROTATING AROUND THE SUN YOU FUCKING RETARD!!!11

>> No.1338248
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1338248

>>1337926
Why is cereal guy not equal to solar guy?

I don't get it

>> No.1338310

A sidereal (star) day is the time taken for the Earth to rotate through 360 degrees. This is 23h 56m. If a particular star is due south, then after a sidereal day the star will be due south again. However, during this time, the Earth will have travelled in its orbit around the sun. A solar day is the duration between two successive times when a position on the Earth points to the sun again. The Earth needs to rotate for 4 minutes more than a sidereal day to allow for its (approx) 1 degree additional travel in its orbit. This means that in a solar day, the Earth actually turns through about 361 degrees.
I hope this has made things clear.

>> No.1338322

Becuase this
http://en.wikipedia.org/wiki/File:Sidereal_Time_en.PNG

>> No.1338324
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1338324

>>1338310
not OP
that was fucking awesome

>> No.1338338

>>1338310
Aye, very well explained.

>> No.1338450 [DELETED] 

>>1338310
OP here. Thank you.

>> No.1339495 [DELETED] 

BONER

>> No.1339555

Simple English Wikipedia to the Rescue~~!!!
http://simple.wikipedia.org/wiki/Sidereal_day

Or a longer definition for those of you who can read well:
http://en.wikipedia.org/wiki/Sidereal_time#Sidereal_time_and_solar_time

>> No.1339733

>>1339555
I can't believe how much better the simple article is than the english one. Concise and to the point with no unnecessary nomenclature.

>> No.1339774
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1339774

>>1338310