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Author Question: How many constellations are on a celestial sphere? How many boundaries are on a celestial sphere? ... (Read 33 times)

formula1

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on: Jul 27, 2018
How many constellations are on a celestial sphere? How many boundaries are on a celestial sphere? Are boundaries unique to a constellation or shared?
 
  What will be an ideal response?

Question 2

What causes precession and why does it move the celestial equator among the stars?
 
  What will be an ideal response?


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rekilledagain

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Reply #1 on: Jul 27, 2018
Answer to Question 1

88 constellations, 88 boarders, shared

Answer to Question 2

Precession is caused by gravitational forces of the Moon and Sun acting on the equatorial bulge of the spinning Earth, causing the Earth's axis to sweep around in a conical motion. Because the celestial equator is defined by the Earth's equator, as the Earth precesses the celestial equator moves slowly against the background of stars.


formula1

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

kusterl

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Reply 3 on: Yesterday
Excellent

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