On Oct. 8, 1873, Ejnar Hertzsprung was born near Copenhagen, Denmark. His father had studied astronomy and worked in finance, and Hertzsprung himself showed interest in astronomy and math, but pursued ...

Step outside tonight in the early evening, when Sagittarius lies above the southwestern horizon. Globular cluster M22 shines brightly at magnitude 5.1, readily observable with binoculars or any size ...

If you get up before twilight begins to paint the eastern sky, you might be able to spot Comet C/2025 A6 (Lemmon). It’s currently in the constellation Ursa Major the Great Bear near the 3rd-magnitude ...

Experience the awe of ancient history and the spectacle of a rare celestial event on this 5-day journey to Luxor, centered around the August 2 total solar eclipse. With an incredible totality of 6 ...

Full Moon occurs late tonight at 11:48 P.M. EDT. October’s Full Moon is traditionally called the Hunter’s Moon. But this October’s Full Moon also has two other names: It is both a Super Moon and the ...

From a distance, Biosphere 2 emerges from the cacti and creosote of the Sonoran desert like a gleaming oasis, a colony of glass and bright white structures. Despite being just outside Tucson, Arizona, ...

The nearly Full Moon passes 4° north of Saturn at 11 P.M. EDT and sits close to the ringed planet all night. Despite our satellite’s proximity, you’ll want your telescope trained on Saturn this ...

Let’s peer into Cetus the Whale to spot 1 Ceres this evening, one day past opposition and glowing at magnitude 7.6, within the reach of binoculars or any small scope. You can use this same string of ...

Before you set your telescope up next time, read through the four following items. I hope one or more of them will help you get more from your session. You’ve placed your solar filter on the front of ...

An ancient solar eclipse changed the course of a military conflict when it cast a shadow on a battle over Corinth between the Spartans, commanded by Cleombrotus, and the invading Persians, led by ...

The Moon reaches apogee, the farthest point from Earth in its orbit, at 5:46 A.M. EDT. At that time, our satellite will stand 251,996 miles (405,548 km) away. With the Moon sinking low in the hours ...

A Full Moon occurs when the Earth is between the Sun and the Moon. The Moon's orbit creates different phases, including a Full Moon. Full Moons have traditional names, like the Sturgeon Moon. The 2025 ...