What dependency makes the answer to 'What is it?' different every few nights?

Answer

The Moon's constant motion and changing proximity to the planets

The constant motion of the Moon across the sky and its changing proximity relative to the planets means that the specific bright neighbor changes frequently, requiring consultation of a current sky guide for the exact date and time.

What dependency makes the answer to 'What is it?' different every few nights?

#Videos

Venus reaches its greatest brightness near the Moon (21 to 27 April)

astronomystarMooncelestial bodybright object