Phases and Eclipses. The Moon orbits the Earth The Moon orbits at an angle with respect to the Earth’s orbit around the Sun The Moon doesn’t shine on.

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Presentation transcript:

Phases and Eclipses

The Moon orbits the Earth The Moon orbits at an angle with respect to the Earth’s orbit around the Sun The Moon doesn’t shine on its own; it reflects sunlight

3 New (couple days) Waxing Crescent (several days) 1 st Quarter Waxing Gibbous (several days) Full Waning Gibbous (several days) 3 rd Quarter Waning Crescent (several days) New Phases:

When the sunlight reflects off the Moon’s far side, we call it a New Moon When the sunlight reflects off on the Moon’s near side, we call it a Full Moon Between New and Full, we see parts of the daytime side of the Moon.

6 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

7 When the Earth’s shadow covers the Moon, we have a lunar eclipse

What we see:

muhammadiqbaldar.tumblr.com

Taken from Ennis, Tx by Taken from Ennis, Tx by Mike Mezuel II

12 Three types of Lunar Eclipses Penumbral lunar eclipse—the Moon only passes through the penumbra of Earth’s shadow Partial lunar eclipse—part of the Moon passes through the umbra of Earth’s shadow Total lunar eclipse—the entire Moon passes through the umbra of Earth’s shadow Who on Earth will be able to see a lunar eclipse? Anyone who can see the Moon (anyone who is on the nighttime side of the Earth during the eclipse)

13 Images from Fred Espenak

14 Why is the Moon red during an 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

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

16 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

17 Photo of a Total Eclipse

18 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

19 Photos of an Annular Eclipse photos taken by Fred Espenak