1. The Changing Moon

2. The Moon

3. Moon’s orbit The orbit period around the earth – 27.3 days
The period of Lunar Phase – 29.5 days
The orbit plane of the moon is tilted by ~5 degree with respect to the earth’s orbit around the sun, unlike other planets

5. Near Side
Far Side

6. Why does the moon change phases?
Our eyes see the illuminated half of the Moon from different angles

7. Waxing and Waning Waning – Waxing –
The lighted portion is getting smaller
Light on the left
Waxing –
The lighted portion is getting bigger
Light on the right

8. Beginning of cycle
End of cycle
Moon Phases

9. Which phase is this?
Full Moon

10. Which phase is this?
Last Quarter

11. Which phase is this?
Waning Crescent

12. Which phase is this?
Waxing Crescent

13. Which phase is this?
New Moon