Question

The time between two successive meridian crossings of the vernal equinox (or any other fixed point in the celestial sphere) is called ___________ day and it is ___________ long.

Answer 1

The best answers to complete this sentence would be the following:

 

“sidereal day”

“upper median”

 

It keeps the time, in the two successive upper meridian of the sun during the crossing. Also it is when the star crosses the celestial meridian.

Answer 2

Explanation:

“sidereal day”

“upper median”

It keeps the time, in the two successive upper meridian of the sun during the crossing. Also it is when the star crosses the celestial meridian.

Hope this helps!