Final answer:
The Moon appears to move its own diameter (0.5 degrees) eastward every hour against the background stars. As it orbits the Earth, the Moon appears to move its own diameter (0.5 degrees) eastward every hour against the background of stars.
Step-by-step explanation:
The Moon appears to move its own diameter (0.5 degrees) eastward every hour against the background stars. This apparent eastward motion is due to the Moon's orbital motion around the Earth and its rotation, which causes it to shift slightly in its position against the fixed stars in the sky over time. This phenomenon is also referred to as "lunar proper motion."
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