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On the equinox, are day and night equal?
Day and night are mostly equal on the equinox. There's a bit more daylight because the sun is a disk, not a point, and Earth’s atmosphere refracts sunlight.
March 19, 2024
Equinox fun: Track sun’s shift between now and the solstice
On this equinox, start tracking the sunset point on your western horizon. You'll see a mighty shift between now and the June solstice.
March 19, 2024
Year’s fastest sunsets happen around equinoxes
The year's fastest sunsets are at the equinoxes, and the slowest are at the solstices. We're talking about how long it takes the sun to sink below the horizon.
March 19, 2024
Supermoons galore in 2024!
What is a supermoon? In 2024, there are 5 new supermoons in a row from January to May, and 4 full supermoons in a row from August to November.
March 9, 2024
What’s a constellation? What’s an asterism?
Constellations and asterisms are patterns of stars. Some asterisms consist of stars from different constellations, and some are part of one constellation.
March 3, 2024
How to know your eclipse glasses are safe
Unscrupulous companies are printing ISO certification labels on fake eclipse glasses. Check here for reputable vendors from the American Astronomical Society.
March 1, 2024
Binoculars for stargazing: Our top 6 tips here
Want to know how to use binoculars for stargazing? Follow our top 6 tips to get the most out of viewing the night sky with a little optical aid.
February 29, 2024
Is Sirius the most luminous star in the sky?
Sirius is the brightest star in Earth's sky because of how close it is to us. It's so bright you might see glints of different colors flashing from it.
February 28, 2024
Year’s latest solar noon happens on February 11
February 11 has 2024's latest solar noon by the clock. Solar noon is a natural event, the instant when the sun is at its highest point for the day.
February 11, 2024
The April 8 eclipse is part of Saros 139. What does that mean?
Enjoy the April 8 eclipse as you witness the 30th of 71 member eclipses in the illustrious procession known as Saros 139. Learn more here.
February 8, 2024
