gen-define-the-phases-of-the-moon-and-give-one-short-worked-exam-e394

Define the phases of the Moon and give one short worked example.

# Phases of the Moon The **phases of the Moon** are the different appearances of the Moon as seen from Earth, caused by the changing relative positions of the Earth, Moon, and Sun. As the Moon orbits Earth, different portions of its sunlit half become visible to us. ## The Eight Main Phases: 1. **New Moon** - Moon is between Earth and Sun (dark side faces us) 2. **Waxing Crescent** - Small sliver visible on the right side 3. **First Quarter** - Right half is illuminated (half moon) 4. **Waxing Gibbous** - More than half illuminated, growing 5. **Full Moon** - Earth is between Moon and Sun (fully illuminated) 6. **Waning Gibbous** - More than half illuminated, shrinking 7. **Last Quarter** - Left half is illuminated (half moon) 8. **Waning Crescent** - Small sliver visible on the left side ## Worked Example: **Question:** If today is a Full Moon, what phase will the Moon be in 7 days from now? **Solution:** - The complete lunar cycle is approximately 29.5 days - In 7 days: 7/29.5 ≈ 0.24 of the cycle (about 1/4) - Starting from Full Moon and moving 1/4 cycle forward: - Full Moon → Waning Gibbous → **Last Quarter** (Third Quarter) **Answer:** The Moon will be in the **Last Quarter** phase (left half illuminated).