Sometimes, the Moon passes in front of other planets, and if the planet is big or close, like Jupiter, Venus, Mars or Saturn, one can see (in a telescope) the planet quickly disappearing behind the lunar limb. The limb where the planet disappears (is being occulted) or reappears should preferably be dark, so the moon should be in its first 14 days (before full moon) for occultations and after being full for reappearances. Stars are being occulted by the Moon instantaneously (for the eye), since stars have such a small angular extend and the Moon travels fast.
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