it is called its umbra
The darker total shadow is called the "umbra"; the lighter, partial shadow is called the "penumbra".
That is also called the axis; the "end-points" of this axis are called the celestial poles.
~An eclipse occurs when the shadow of one celestial body falls on another. ~Changes in the appearance of the moon are called phases.
"eclipse"
In the past I have read a book called 'The Celestial Globe'.
the shadow of the sundial is just called a shadow
Astronomy is the study of celestial objectsRadio astronomy is the study of celestial objects that emit radio waves.
A Comet
Pole
celestial sphere A+
Conjunction
Astronomy.