The Diurnal Motion and the Zodiac





 

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Diurnal motion

If you fix your camera to the North at night and shoot for several hours, you will see the stars move in circles around the Polaris.
The motion of a star in a circle, once a day, is called diurnal motion. The motion of the star is due to the Earth’s rotation.
The sun and moon also have diurnal motion because of the Earth’s rotation. Day and night are also caused by the Earth’s rotation.

Direction of diurnal motion

No matter where I am located, all celestial bodies rise in the east and set in the west. (Excluding north and south points)
However, depending on the latitude where you are located, the trajectory of the diurnal motion is slightly different. At the north or south pole, it rotates around the zenith. This is because the north and south poles are the centers of rotation. On the other hand, closer to the equator, celestial bodies ascend and descend more vertically.