1. Eclipses

2. Eclipses
The Sun and Moon occasionally line up so that we have an eclipse.
These eclipses happen every year
To see a solar eclipse, you need to be on a particular part of the Earth

3. Eclipses First Important thing to remember.
The Sun and the moon have the same Apparent size.
Apparent size is how large an object appears to be from a specific distance. 
The sun is 400 times wider than the moon, but coincidently it is also 400 times further away.
The only moon in the solar system known to do this………

4. Eclipses Lunar Eclipse
happens when the Earth comes in between the Sun and the Moon. This casts a shadow over the Moon.
Lunar eclipses happen in most years, and everyone on the dark side of earth can see it.
Why?

6. Lunar Eclipse
What phase must the moon be in for a Lunar eclipse to occur?

7. Lunar Eclipse
The moon makes an orbit every 27 days, so why don’t we see a Lunar Eclipse every month?
The Moon is tipped about 5 degrees in its orbit.

9. Lunar Eclipse
Quick video of an eclipse.
Why is the moon red?

10. Lunar Eclipse
The Earth’s atmosphere filters some sunlight and allows it to reach the Moon’s surface
The blue light is removed—scattered down to make a blue sky over those in daytime
Remaining light is red or orange
Some of this remaining light is bent or refracted so that a small fraction of it reaches the Moon
Exact appearance depends on dust and clouds in the Earth’s atmosphere

11. Solar Eclipse When the Moon’s shadow covers part of the Earth
Only happens at New Moon
Three types: Annular, Partial, and Total

12. Total Solar Eclipse
Observers in the “umbra” shadow see a total eclipse (safe to view the Sun); can see the corona
Those in “penumbra” see a partial eclipse—not safe to look directly at Sun
Only lasts a few minutes
Path of Totality about 10,000 miles long, only 100 miles wide

13. Map of future Solar Eclipses

14. Annular Solar Eclipse
When the Moon is too far to completely cover the Sun—the umbra doesn’t reach the Earth
Sun appears as a donut around the Moon