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Arietids – most active daytime meteor shower – around June 10

The Arietids - the most active daytime meteor shower - peak on the mornings around June 10. Watch for them before dawn while blocking out the light of the moon.

Editors of EarthSky

June 5, 2026

Can a single season have only 2 full moons?

We know it's possible to squeeze 4 full moons into a single season. But can a season have just 2 full moons? Turns out it can, but it is rare.

Bruce McClure

May 31, 2026

What is a micromoon? The last one for 2026 is in June

What is a micromoon? It's a full or new moon near its farthest from Earth for the month. Depending on your definition, 2026 has either 2 or 3 full micromoons.

Deborah Byrd

May 31, 2026

Blue Moon – and smallest full moon of 2026 – on May 30-31

There's a full Blue Moon overnight on May 30-31, 2026. A Blue Moon is the 2nd of 2 full moons in a calendar month or the 3rd of 4 full moons in a single season.

Editors of EarthSky

May 25, 2026

Constellations and signs: What’s the difference?

What is the difference between the signs of the zodiac and the constellations of the zodiac? Astronomer Guy Ottewell illustrates and discusses this difference.

Guy Ottewell

Editors of EarthSky

May 20, 2026

Happy May Day! Today is an astronomy holiday

Happy May Day! This annual celebration has its roots in astronomy as 1 of 4 cross-quarter days. Dancing around a maypole is a traditional May Day celebration.

Deborah Byrd

May 1, 2026

Here’s how to see the Lunar X and V at 1st-quarter moon

Lunar X and Lunar V are optical features on the moon. They are visible through a telescope for several hours around the time of the 1st quarter moon.

Deborah Byrd

April 23, 2026

Meet M13, the Great Globular Cluster in Hercules

Many stargazers call it the finest globular cluster in the northern half of the heavens. It's M13, also known as the Great Globular Cluster in Hercules.

Bruce McClure

April 21, 2026