Here's why:
* Occultation refers to the event where one celestial object passes in front of another, blocking it from view. This is often used for events like a moon passing in front of a star.
* The westward drift of planets is a result of the Earth's rotation and the planets' own orbital motion around the sun.
Here's a more detailed breakdown:
* Earth's Rotation: The Earth rotates on its axis from west to east. This causes the apparent motion of stars and planets to move from east to west across the sky.
* Planet's Orbital Motion: Planets orbit the sun, and their positions relative to the Earth change over time. This change in position, combined with Earth's rotation, results in the observed westward drift.
In summary: Occultation is a blocking event, while the westward drift of planets is a result of the combined motion of Earth and the planets themselves.