ESSENTIAL KNOWLEDGE of the CALENDAR

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Let's imagine you are a space traveler, just returning from a tour of the heavens. You are parked one million miles from the planet Earth and it is now the month of February. Looking out of the window of your spacecraft, you are viewing the moon's orbit about the planet Earth. The orbital path of the moon is from your left to your right, passing in front of Earth. Receding from you, the moon passes behind Earth, moving from your right to your left. Your flight computer indicates the phases of the moon on the February calendar, as it would be seen from Earth. The space traveler will note that the Earth spins around once during a 24-hour day. The moon appears to take exactly 29.5 days to complete one orbit about the Earth, nearly a 30-day month, from full-moon to full-moon, as observed from the Earth.

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