Waxing Cresent, Moon phase of Saturday, November 21st, 2020

Tonight's actual moon phase and image of the moon (Moon phase tonight)

(Actual current moon image from Nasa)
Moon phase tonight (takes a few seconds to calculate the image of the moon phase; please be patient...)

This page shows the image of today's/tonight's actual moon phase and allows you to follow the moon phases or moon cycles as they are also called.


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A waxing crescent moon-sometimes called a "young moon" is always seen in the west after sunset. At this moon phase, the Earth, moon and sun are located nearly on a line in space. If they were more precisely on a line, as they are at new moon, we wouldn't see the moon. The moon would travel across the sky during the day, lost in the sun's glare. Instead, a waxing crescent moon is seen one day to several days after new moon. It rises one hour to several hours behind the sun and follows the sun across the sky during the day. When the sun sets, and the sky darkens, the moon pops into view in the western sky.

Because the waxing crescent moon is nearly on a line with the Earth and sun, the "day side" is facing mostly away from us. We see only a slender fraction of the day side: a crescent moon. Each evening, because the moon is moving eastward in orbit around Earth, the moon appears farther from the sunset glare. Each evening, as the moon's orbital motion carries it away from the Earth/sun line, we see more of the moon's day side. Thus the crescent in the west after sunset appears to wax, or grow fatter each evening.

Note that a crescent moon has nothing to do with Earth's shadow on the moon. The only time Earth's shadow can fall on the moon is at full moon, during a lunar eclipse. There IS a shadow on a crescent moon, but it's the moon's OWN shadow. Night on the moon happens on the part of the moon submerged in the moon's own shadow. Likewise, night on Earth happens on the part of Earth submerged in Earth's own shadow.

You sometimes see a pale glow on the darkened portion (night side) of a crescent moon. This glow is due to light reflected from Earth's day side. It's called "earthshine."

Read more at EarthSky.org

Days Until Next Full Moon
10 days
Days Until Next New Moon
24 days
Percentage of Illumination
31%

Interactive moon phases tool

Ready to explore other moon phases? This tool shows the current moon phase and allows you to shift the phases and see how the moon is illuminated at each phase.

Credit: NASA

Diagram explaining the moon phases

This diagram shows the relative positions of the Sun, the Moon and earth and explains how the different moon phases appear.

The visible part of the moon is the part of the moon's surface that gets hit by the sunlight. The rest of the moon disc is almost invisible.

The moon phases are not caused by the shadow of the earth on to the moon. It is the moon's own shadow at the part of its surface that is not hit by the sunlight.

In other words, the visible "sunny" part is made of the places where there is "day" on the moon and the shadow part is where there is "night".

Moon phases diagram explained. Sun, Earth, Moon

Credit: NASA/JPL-Caltech.