Big sister is watching you

@Nightweaver20xx  
Sadly, horses only have a middle finger.
 

Share your knowledge in secret, Twi. Then the uprising can be constructed under your former mentor’s nose.

@solidus_edge  
Celestia: That astrology 101 Twilight!

Celestia thought: Do it Twilight. Do finish the theory. Say it.… Your on the right track… drn me.

@Background Pony #43EC  
>>851301p (deleted)

@Fwelin  

 
The friction produced by the altered momentum would cause everything in the atmosphere to instantly burst into flame.

@Background Pony #F389  
Unless Celestia the one to point out what she does.

@AaronMk  
If that weee true, Twilight and the Storm King would have utterly failed to move the sun when they tried, as they’d be targeting the wrong object, being under the impression that Celestia does move the sun.
 
Not to mention that it would be incredibly easy to tell if the planet stopped or started rotating instantaneously for any remotely familiar star-planet system. The Earth rotates at over 400 meters per second; if it suddenly stopped on a dime, everyone on the planet would be sent flying to their deaths, and similarly disastrous effects would happen from a planet’s angular velocity instantly accelerating the same amount from rest.

Celestia is a joke, Twilight. You can take her!

Twilight: OMG! Celetia is the center of our galaxy and all the planets revolve around her. I wonder why she doesn’t want us to know.  
Celestia: Cause i already get some weird stuff for ponies thinking that I rotate the the sun around them and definitely don’t want to find out what they’ll do if they learn I moving planet around and preventing them from going all over the place… too late they already know.

Fun fact: Before Galileo, the Catholic Church actually didn’t consider their planet to be in the centre of the universe, since it was considered the absolute pinpoint of Hell

If Celestia had index fingers, she’d be pointing both of them at Twilight while slowly backing out.

watch yourself, twiggles

Or Celestia actually just controls the rotation of the planet.

@ObliviaTheChangeling
 
We’ve seen the moon and the sun in the sky moving at changing rates relative to each other however, so at the very least Luna (or whoever is controlling the moon at a given time) must also be able to move the moon with respect to Equestria, even if they only move Equestria with respect to the sun.

@Background Pony #F389  
Celestia wants to believe she controls the sun. In reality, she controls the world of Equestria and manually moves it around the sun.

It’s a little extra funny when you consider that an orrery of (what I presume is) the Equestrian solar system has appeared in the show before, and that it too had all the planets going around the sun.  
 
It brings to mind the idea that everyone actually knows the heliocentric model is correct, but no one wants to contradict Celestia on it.