american astronomical society
Post on 25-Nov-2021
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MOON PHASES FOR 2021
Luna
r ph
ases
Not to scale
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)
Perigee
Apogee
Perihelion(Jan 3)
Aphelion(Jul 4)
Moon Orbit
Earth Orbit
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
Annular eclipses
CREDIT: Rick Fienberg(AAS Press Officer)
June 10th
2021
Annular Eclipse – June 10th 2021
June 10th 2021: Annular Eclipse Viewing Locations
October 14th 2023
April 8th
2024
How long do eclipses last?
Annular (2023)To
tal
(202
4)
Annular Eclipse: 918 days Total Eclip
se: 1095
days
Annular Eclipse:
62 days
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