American Astronomical Society
Transcript of American Astronomical Society
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MOON PHASES FOR 2021
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Luna
r ph
ases
Not to scale
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Perigee
Apogee
362,570 km 405,410 kmAt apogee, the Moon is farther from the Earth and looks slightly smaller
At perigee, the Moon is closer to the Earth and looks slightly larger
Moon’s Orbit is elliptical (greatly exaggerated here)
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Perigee
Apogee
Perihelion(Jan 3)
Aphelion(Jul 4)
Moon Orbit
Earth Orbit
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Annular Solar Eclipses
The angular sizes of the moon and the sun vary, depending on their distance from Earth.
When Earth is near perihelion, and the moon is near apogee, we see an annular solar eclipse.
Perigee Apogee Perihelion Aphelion
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Annular eclipses
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CREDIT: Rick Fienberg(AAS Press Officer)
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June 10th
2021
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Annular Eclipse – June 10th 2021
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June 10th 2021: Annular Eclipse Viewing Locations
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October 14th 2023
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April 8th
2024
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How long do eclipses last?
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Annular (2023)To
tal
(202
4)
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Annular Eclipse: 918 days Total Eclip
se: 1095
days
Annular Eclipse:
62 days
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