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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.
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.
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.
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.
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.
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.
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.
April 21, 2026
New meteor shower from an asteroid being eroded by the sun
A new meteor shower has been linked to an asteroid that was broken up when it passed too close to the sun. Find out more here.
April 15, 2026
International Dark Sky Week is April 13 to 20
Celebrate dark night skies and limit light pollution by raising awareness with International Dark Sky Week, April 13 to 20, 2026. Find links here.
April 12, 2026
Looking for sky almanacs? EarthSky recommends …
Here are some almanacs that show you the rising and setting times for the sun, moon, planets and satellites in your sky.
April 10, 2026
