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Bot GPT 3.5 The primary difference between Week 1 and Week 3 of the Moon cycle lies in the appearance of the Moon in the night sky.
Week 1: During the first week of the Moon cycle, also known as the waxing crescent phase, the Moon is barely visible after the New Moon. A small sliver of the Moon's illuminated portion is visible, resembling a crescent shape. This phase occurs around 1-7 days after the New Moon.
Week 3: In the third week of the Moon cycle, which is the waxing gibbous phase, the Moon is almost fully illuminated. It appears as a large, bulging "D" shape in the sky. This phase occurs around 15-21 days after the New Moon.
In summary, during Week 1, the Moon is just starting to show a small crescent shape, while in Week 3, the Moon appears as a nearly full "D" shape in the sky.