Apparent daily motion refers to the perceived movement of celestial objects, such as the Sun and stars, across the sky over the course of a day due to the Earth's rotation on its axis. This motion gives the illusion that these objects rise in the east and set in the west. While the actual positions of these celestial bodies remain relatively fixed in space, their apparent movement is a result of our perspective from the rotating Earth.
That is called 'apparent retrograde motion'.See the related link listed belowfor more information.
The sun's apparent daily movement across the sky is caused by the Earth’s rotation on its axis. As the Earth spins from west to east, the sun appears to rise in the east, travel across the sky, and set in the west. This motion creates the illusion of the sun moving, while in reality, it is the Earth's rotation that is responsible for this phenomenon.
When that happens, the planet moves from east to west, from our point of view. This should not be confused with the daily motion of all stars + planets due to Earth's rotation; rather, to the planet's movement against the background of the stars.
The apparent westward movement of a planet is known as retrograde motion. This phenomenon occurs when a superior planet passes Earth in its orbit, making it appear to move backward in the sky relative to the stars.
The geocentric model can explain the apparent motion of celestial bodies, such as the Sun, Moon, and stars, appearing to move across the sky from east to west. This model posits that the Earth is at the center of the universe, and as these bodies orbit around it, they create the illusion of daily motion. Additionally, the retrograde motion of planets can be accounted for by the relative positions and movements of Earth and the other planets in this framework. However, this model struggles to explain some phenomena, leading to the eventual acceptance of the heliocentric model.
The apparent daily motion of the sun is from east to west due to the rotation of the Earth on its axis.
The rotation of the earth around its axis.
The real motion of stars is hardly noticeable even over a period of many years. It's the Earth's daily rotation the is the main cause of their apparent motion. (Stars are so far away that the Earth's revolution around the Sun hardly cases any apparent motion.)
A planet is said to be in retrograde motion when its apparent motion - the motion as seen by us, against the background stars - is from east to west.Planets spend more time in prograde motion, from west to east. The apparent movement of Sun and Moon against the background stars is also from west to east. Not to be confused with the daily motion, due to Earth's rotation.
Motion parallax.
mercurys motion can be like any other planets motion
Actual motion and apparent motion.
Accelerates the motion of an object.
Motion
That is called 'apparent retrograde motion'.See the related link listed belowfor more information.
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Gravity for the real motion, the Earth's rotation for the apparent motion.