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Moon Phases & Eclipses
Objectives
• Why does the Moon have phases
• How do the Earth and Moon affect each other
• What are eclipses
Why Does the Moon Look
Like That ?!?!?
The Moon Orbits the Earth• Does the Moon give off
its’ own light?
• Half of the Moon is always lit up by the Sun-we see parts of that half.
• The Moon reflects Sunlight
• Its appearance depends on the relative geometry of the earth-sun-moon system
Moon light comes from_____
A. Reflected light from Earth
B. Reflected Sun light
C. Light produced by the Moon
D. Lots of Moon people with flash lights
Q: You see a full Moon on the Meridian. About what time is it?
A) 12:00 AM (midnight)
B) 6:00 PM
C) 12:00 PM (noon)
D) 6:00 AM
Q: It’s about 6:00 PM local time. You look up and see the Moon is crossing your meridian. What phase is it in?
A) Waning crescent
B) 1st quarter
C) 3rd quarter
D) Waxing gibbous
Q: You see a full Moon on the western horizon. About what time is it?
A) 12:00 AM (midnight)
B) 6:00 PM
C) 12:00 PM (noon)
D) 6:00 AM
LT
The Cause of Moon Phases
• Pg 81
Predicting Moon Phases
• Pg 85
Solar System Distances
Elongation Angle!!!
Laser Distance
McDonald Observatory, TX
Moon
D=384,000 km
Eclipses
Solar Eclipse: The moon passes between the Sun and Earth
Lunar Eclipse: The Earth passes between the Moon and the Sun
Why don’t we see a solar and lunar eclipse every month?
Moon-Earth-Sun Geometry
How likely are Eclipses?
~5°
Ecliptic
moonSun
Lunar Eclipse
Penumbra
Solar Eclipse
Total Solar Eclipses
Laramie!!!
• Lunar eclipses only occur during the _____ Moon phase, and solar eclipses only occur during the _____ Moon phase.
A) Full, 1st quarter
B) New, Full
C) New, 3rd quarter
D) Full, New
Observing tonight???