What is the required condition for an observer at exactly $90^ ext{o}$ latitude to see the Moon during a cycle?
Answer
The Moon's declination must be greater than the tilt of its orbital plane relative to the Earth's equator at that time.
An observer at exactly $90^ ext{o}$ latitude will only see the Moon if its declination is greater than the tilt of the Moon's orbital plane relative to the Earth's equator at that specific time in its cycle.
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