1. Eclipses
Notes: E

2. 1 lunar revolution
27.3 Days
1 lunar rotation
27.3 Days
Therefore:
We always see the same side of the moon from earth

3. 2 types of eclipses:
1. Lunar
Earth gets in the way of the sun’s light reflecting off the moon.
2 parts to the shadow of a sphere
1. Umbra
The dark center region
2. Penumbra
Lighter cone shaped regions surrounding the umbra

5. Total Lunar Eclipse
Entire moon travels inside the earth’s umbra
Partial Lunar Eclipse
At least part of the moon never gets into the umbra (stays in penumbra)
Occur about once per year, b/c moon’s orbit is on a 5o incline
Full moon phase
Nighttime half of earth sees it

8. 2. Solar
Moon gets in the way of the sunlight that should be hitting the earth
Partial Solar Eclipse
Earthling is standing inside the moon’s penumbra
Looks like dusk outside

9. Total Solar Eclipse
Earthling is standing inside the moon’s umbra
Looks like nighttime
Temperature goes down
Photosphere is totally blocked
Must be in the “eclipse path” to see the eclipse
Occurs:
At new moon
About once per year
When earth and moon are level

14. Eclipse Path
Shadow’s track on earth
Must be standing inside it to see a solar eclipse