Moon Phases

by Allie Collier and Claire Rowat
Blue/7 Earth Science Fretz

What are the Phases of the Moon?

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8 Phases of the Moon

1. New Moon
2. Waxing Crescent
3. Waxing Quater (First Quater)
4. Waxing Gibbous
5. Full Moon
6. Wanning Gobious
7. Wanning Quater (Last Quater)
8. Wanning Crescent

Waxing=When the moon looks bigger
Ex. Waxing leads to a full moon

Waning=When the moon looks smaller
Ex. Wanning leads to a new moon
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Why do they Occur?

1. Seen by reflected sunlight
2. The moon is in orbit around the Earth

Moon Facts

Lunar Month=The time from one new moon to the next
-29.5 days
-1 revolution is 27.3 days

Penumbra=The partial shadowing surronding the umbra (Lighter)
Umbra=Total shadow from the Earth (darker)

During new moon and full moon the Earth, moon, and the sun form a 180 degree line in space

Eclipses

*Eclipses are named for what they block out

Lunar Eclipse=When a full moon passes into the Earth's umbra and becomes shaded from the Earth
-Sun's rays are blocked outexternal image lunar.eclipse-a.jpg
-Can only occur during the full moon phase
-Doesn't occur often
-Total eclipse occur when the moon is fully within the umbra
-Usually occurs once a year
-Doesn't occur every month due to the 5 degree inclination from the Earth's orbit and the moon's orbit
-Dusky red and coppery colored (Earth's atmosphere bends light rays to red)
-Can last for 2 hours

Solar Eclipse=When the moon's umbra reaches the Earth's surface blocking out the sun
-Moons umbra is long enough to reach Earth only at an apogee
-The moon blocks the entire photosphere of the sun
-Can only occur at the new moon phaseexternal image solar_eclipse_98.jpg
-Doesn't occur every month due to the moon's angle of orbit
-Shadow falls above or below Earth
-Usually one solar eclipse per year
-Bright stars and planet can be seen clearly during this time
-Relative viewing location can be found every 300 years!
-Lasts 7.5 minutes


Apogee=The point of orbit farthest away from the Earth
-You see the sun as a thin bright ring around the moon
-During a solar eclipse the umbra shadow fails to reach Earth

Perigee=The point of orbit closest to the Earth

Annular=When observers see the sun's ring around the moon in apogee
-Known as a ring eclipse

Eclipse Path=The track of Moon's shadow racing across Earth at 1600 kilometers per hour
-Path could be 1,000's in kilometers

Umbra_Explained_m.jpg

eclipse-diagram.jpg


References

Earth Science textbook, Chapter 24 (IV)
Science class moon notes
Moon test and study guide
Moon lab
Miracle of the Lunar Eclipse Lab


GOOD LUCK! (=