The Changing Moon
The Moon
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
Near Side Far Side
Why does the moon change phases? Our eyes see the illuminated half of the Moon from different angles
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
Beginning of cycle End of cycle Moon Phases
Which phase is this? Full Moon
Which phase is this? Last Quarter
Which phase is this? Waning Crescent
Which phase is this? Waxing Crescent
Which phase is this? New Moon