Moon Phase Today: How the Moon Appears on May 21, 2026

The Moon is currently in its Crescent phase, gradually becoming more illuminated each night as it progresses through the lunar cycle. This cycle, lasting approximately a month, showcases the Moon’s evolving phases as it orbits around Earth.

What Moon Phase Can You Expect Tonight?

As of Thursday, May 21, the Moon is in its Waxing Crescent phase. Tonight, about 27% of the Moon’s surface will be illuminated, according to NASA’s Daily Moon Guide.

With the naked eye, you can observe the Mare Crisium and Mare Fecunditatis. If you use binoculars or a telescope, you’ll also be able to see the Endymion Crater quite clearly.

When Will the Next Full Moon Occur?

May features two Full Moons, with the next one scheduled for May 31.

How Do Moon Phases Work?

NASA explains that the Moon takes roughly 29.5 days to complete an orbit around Earth, during which it transitions through eight distinct phases. Although the same side of the Moon always faces our planet, the angle of sunlight striking its surface varies throughout the orbit. This variation creates the recognizable full, half, and crescent shapes we observe in the night sky. The lunar cycle encompasses eight primary phases:

New Moon – During this phase, the Moon is positioned between Earth and the sun, rendering the side facing us completely dark and invisible.

Waxing Crescent – A small sliver of light becomes visible on the right side (in the Northern Hemisphere).

First Quarter – Half of the Moon appears lit on the right side, resembling a half-Moon.

Waxing Gibbous – More than half of the Moon is illuminated, but it has not yet reached full brightness.

Full Moon – The entire face of the Moon is fully illuminated and clearly visible.

Waning Gibbous – The Moon begins to lose illumination from the right side (in the Northern Hemisphere).

Third Quarter (or Last Quarter) – Another half-Moon appears, but this time the left side is illuminated.

Waning Crescent – A thin sliver of light remains visible on the left side before the Moon fades back into darkness.