Eclipses Eclipses The Sun and Moon occasionally line
- Slides: 14
Eclipses
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
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………
Eclipses • Lunar Eclipse – 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?
Lunar Eclipse • What phase must the moon be in for a Lunar eclipse to occur?
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.
Lunar Eclipse • Quick video of an eclipse. – Why is the moon red?
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
Solar Eclipse • When the Moon’s shadow covers part of the Earth • Only happens at New Moon • Three types: Annular, Partial, and Total
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
Map of future Solar Eclipses
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
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