In the lunar cycle, the moon goes through different phases. Week 1 typically coincides with the New Moon phase, while Week 3 is associated with the Full Moon phase.
- Week 1 (New Moon): The moon is not visible from Earth.
- Week 3 (Full Moon): The moon is fully illuminated and visible.
So the difference between week 1 and week 3 of the moon's cycle is that one is a New Moon and the other is a Full Moon.
Answer: New vs. Full