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

https://eclipse.aas.org/