September 22 is the equinox. The word means "equal night." Days and nights are nearly equal now at the equinox, but not quite. Here's why. Also, we've got a new word for you, "equilux." It's the word for when day and night are, in fact, equal.

Learn what it would be like to travel to Chile - sometimes called astronomy's world capital - in this final report from Robert Pettengill with the Astronomy in Chile Educator Ambassador Program. Thank you for your dispatches, Rob!

Jupiter and Saturn have appeared close on our sky's dome throughout 2019, but they're due to get even closer in the coming months. Their conjunction will come on December 21, 2020. Here's how to watch them.

Robert Pettengill reports from the busy ACEAP (Astronomy in Chile Educator Ambassador Program) annual trip, happening now in Chile.

Members of the Astronomy in Chile Educator Ambassadors Program are heading to Chile for a tour of its great observatories, July 27 to August 5, 2019.

Astronomer Guy Ottewell talks about his awesome book about some of our solar system's most beloved outer worlds. As always, he provides the best charts anywhere!

Some called it the "astronomer's eclipse" because it passed near major observatories in Chile. Check out these beautiful images of the July 2, 2019, total solar eclipse.

It was the closest conjunction of 2 planets in 2019, between Mercury and Mars. It happened low in the evening twilight - and was best seen from Earth's Southern Hemisphere. Check out these photos from EarthSky Community members.

People have reported seeing Transient Lunar Phenomena - unusual flashes and other lights on the moon - for at least 1,000 years. Yet they're still mysterious. Now a scientist in Germany is using a new telescope to try to solve the mystery.

Guy Ottewell lives in England. His illustrations of 3-dimensional space are illuminating. Long summer twilights, explained.