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Matome Modiba (University of Witwatersrand, South Africa (ZA))

Second Equatorial System question in Astronomy I

Just as a follow up, correct me if I am wrong, but isn't it that the sun doesn't move? Because when you explain the concept of ecliptic and equinoxes, you talk about the sun as if it is a moving object.

August 18 2014, 10:19 pm

Houston Muzamhindo (University of Cape Town, South Africa (ZA))
You are somewhat correct. The sun in reality moves very very slowly about the center of the Milky Way Galaxy. For our purposes, our assumption is that the earth is still and everything is moving around it. The motion of the earth causes day, night, motion of the stars in the skies etc but here we attribute that motion of the heavenly bodies to the rotation of the celestial sphere, that's why I was saying the sun moves.

August 19 2014, 12:00 pm


Matome Modiba (University of Witwatersrand, South Africa (ZA))
Oh alright, that makes sense now, thanks man.

August 19 2014, 11:13 pm


Ramunenyiwa Thabelo (Not registered at a university, South Africa (ZA))
no the sun doesnt move the globe is the one move through the north pole and south pole

August 17 2015, 1:21 pm


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