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Neptune at opposition on September 26, 2026
Neptune at opposition -- when it's opposite the sun on the sky's dome -- comes on September 26, 2026. You'll need optical aid to spot it.
September 25, 2026
Seeing Saturn’s rings: Top tips for beginners
If you want to see Saturn's rings, late September and early October 2026 is a great time to look. Grab a telescope and read the tips found here!
September 25, 2026
Full moon names by the month and by the season
Lists of common full moon names — both by month and by season — for North America. And a word about full moon names in the Southern Hemisphere.
September 24, 2026
2027 September equinox: All you need to know
The September equinox is almost here! Autumn for the Northern Hemisphere. Spring for the Southern Hemisphere. Here's all you need to know.
September 24, 2026
Are day and night equal on the equinox? Not exactly
Are day and night equal at an equinox? No. There's slightly more day than night on the day of an equinox. Find out why here.
September 22, 2026
International Observe the Moon Night 2026 is tonight
International Observe the Moon Night is September 19, 2026. It's a global event for celebrating the moon. Here's how you can participate online or in person.
September 19, 2026
Forms of aurora: Arcs, curtains, coronas and more
Here are some of the forms of aurora that you might see. Some are more common, such as diffuse glows, while others are a sign of a big geomagnetic storm.
September 18, 2026
See the year’s fastest sunsets and sunrises around equinoxes
The year's fastest sunsets and sunrises happen around the equinoxes, and the slowest sunsets and sunrises happen around the solstices.
September 17, 2026
Equinox fun: Track the sun’s shift now until 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.
September 17, 2026
Why is planet Venus so bright in Earth’s sky?
You can't miss dazzling Venus after sunset! It's the 3rd brightest object in the sky, after the sun and moon. But why is Venus so bright?
September 16, 2026
