Lecture 2, Coordinate systems in astronomy. The horizon coordinate system. Diurnal motion of celestial objects in horizon system. Objects move on diurnal circles centered on the celestial pole. Why sky changes appearance in different places on the Earth.
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The horizon coordinate system
Objects move on diurnal circles centered on the celestial pole
As the Earth rotates, the zenith points in different directions
a system like latitude and longitude for the celestial sphere
The seasonal changes in the night sky…
The difference between sidereal and solar time
Also look at online animation with the book web site