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Editors of EarthSky
Dwarf planet Ceres discovered 225 years ago today
Dwarf planet Ceres was discovered by Giuseppe Piazzi on January 1, 1801. That was 225 years ago. It was 1st considered an asteroid.
January 1, 2026
Why is there no eclipse every full and new moon?
If the moon orbited Earth on the same plane that Earth circles the sun, we'd have an eclipse at every full and new moon. Here's why we don't.
January 1, 2026
Neptune at opposition on September 26, 2026
Neptune at opposition - when it's 180 degrees from the sun on the sky's dome - comes on September 26, 2026. You'll need optical aid to spot it.
January 1, 2026
New Year’s Star Sirius, the moon and Jupiter ring in 2026
Entertain your friends on New Year's Eve by showing them the New Year's Star, the soon-to-be full supermoon and Jupiter. Sirius is highest at midnight.
December 31, 2025
Why does the New Year begin on January 1?
Why does the New Year begin on January 1? The tradition stems from the festival of Janus, the Roman god of past and future.
December 31, 2025
Earth at perihelion – closest to sun – on January 3
Every year in early January, Earth reaches its closest point to the sun in an event called perihelion. In 2026, it's on January 3.
December 27, 2025
Latest sunrises late December and early January
Did you know the latest sunrises don’t occur on the shortest day, and the latest sunsets don’t fall on the longest day of the year?
December 23, 2025
Solstices and equinoxes seen from space
See how sunlight falls on Earth's surface during the solstices and equinoxes, and get a better understanding of why Earth's tilt causes the seasons.
December 21, 2025
Interstellar object Comet 3I/ATLAS leaving the solar system
Interstellar object Comet 3I/ATLAS makes it closest pass by Earth today (December 19, 2025). How close will it come? And where will it go after this?
December 19, 2025
Year’s shortest season to start at December solstice
The year's shortest season - between the December solstice and March equinox - is about 89 days. It's 5 days shorter than the longest season.
December 18, 2025
