The Sun, Earth

1
The Sun, Earth Moon Patterns in the Sky
2
Lunar Phases
3
Lunar Phases
What is the phase of the Moon?
Full!
What time of day will the full moon set?
6 a.m.
West
East
4
Lunar Phases
What is the phase of the Moon?
Waning Crescent
What time of day will the Waning Crescent be seen
high in the sky?
9 a.m.
West
East
5
Lunar Phases
What is the phase of the Moon?
Waxing Gibbous
What time of day will this moon phase rise?
3 p.m.
When will this phase be near the western horizon?
2 a.m. or so
West
East
6
Synodic Period
Sun
Sidereal Period
Moon
7
Sidereal Lunar Period

• One complete orbit around the Earth. Just one
  complete trip around to the same beginning
  location.
• Moon's Sidereal Period is 27.3 days.

Synodic Lunar Period

• Time between one full (new) moon until the next
  full (new) moon.
• Earth is also revolving around the Sun!
• We need to get the same orientation to get
  successive like moon phases.
• Synodic period is 29.5 days.
• (The month). "Moonth."

8
Lunar Motions
What is a trip across the sky for the moon?
Daily the moon rises in the East and sets in the
West. (Westward)
Why? Earths revolution is West to East!
West
East
9
Lunar Motions
What is a trip across the sky for the moon?
During the month the Moon moves EASTWARD across
the sky!!
Why? Moons orbit around the Earth during the
Month! Moon rises 51min later each day.
Feb. 15, 9pm
Feb. 16, 9pm
Feb. 17, 9pm
Feb. 18, 9pm
Feb. 14, 9pm
West
East
10
Earthshine
We can actually view a small amount of glow
from the un-lit portion of the moon. Sunlight
manages to reflect off of the Earth and its
atmosphere towards the moon. The light then
bounces from the moons surface back to the Earth.
This gives observers on Earth the ability to
slightly see the dark portion of the moons
surface not in direct sunlight.
Leonardo DaVinci 500 years ago.
11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)