The Moon’s Dazzling Last Quarter Phase!

Get ready, skywatchers! The Earth’s moon is about to enter its enchanting last quarter phase this week on the morning of May 20 at 7:59 a.m. EDT (1159 GMT). This celestial event will have the moon twinkling over 30 degrees above the southern horizon, making for a sight you won't want to miss!

Prime Viewing Time!

The optimal moment to gaze at our moon, nearly half illuminated, will be in the early hours before it reaches the last quarter phase. On the night of May 20, you can expect a mere 39% of the moon's surface lit, with shadows lengthening across its face as we journey toward the new moon on May 26.

Spotting the Craters!

On May 20, the moon will display a dramatic half-lit appearance, vividly illuminating features like the prominent Tycho crater. This 53-mile-wide (85 km) crater is a must-see through a telescope, where its distinctive central peak casts striking shadows.

Don’t overlook the nearby Copernicus Crater, which is a stunning sight just left of the terminator, near the lunar equator. The darker regions, like Oceanus Procellarum (Ocean of Storms), will also be captivating on this night.

A Trip Back in Time!

These lunar maria were formed billions of years ago by ancient lava flows that cooled down in impact basins—long before the solar system settled into its current state. Get lost in the beauty of these vast basaltic plains, easily visible from Earth!

Celestial Companions!

As the moon rises in the southeastern sky at 1:55 a.m. EDT (0555 GMT), it will be joined by stars from the constellations Aquarius and Capricornus. For those early risers, stunning stars like Altair and Vega will be twinkling above the moon, while the planets Saturn and Venus will climb higher into the sky to the left.

Prepare for Astrophotography!

For budding astrophotographers, this week is perfect for capturing the moon's details. Make sure to check out the best equipment for the job in 2025, and don’t miss our guide on photographing the moon to get those stunning shots!

Final Thoughts!

Whether you're a seasoned stargazer or just curious, the moon's last quarter phase is a captivating display that brings both beauty and scientific wonder. So mark your calendars, get your telescopes ready, and enjoy a night under the stars!