Welcome to StarDate

Home of America’s longest-running national daily astronomy radio feature.
And so much more.


June 19, 2024

Radio: Today’s Episode

Premium Same-Day Audio Access lets you stream episodes of StarDate the same day they air.
Log in or subscribe now to listen!

Radio: Yesterday’s Episode


  • Moon and Antares

    Antares, the orange supergiant star that marks the heart of Scorpius, the scorpion, huddles quite close to the Moon at nightfall, with the gap closing as the night goes on.

  • Doomed Giants

    Three bright stars in this evening’s sky have a lot in common. Deneb, Antares, and Spica are among the biggest, brightest, and heaviest stars in the galaxy, and each will end its life with a titanic explosion known as a supernova.

  • Guardian Stars

    The stars that mark the outer edge of the Little Dipper are known as the Guardians of the Pole. That’s because they are not far from the Pole Star, Polaris. They circle around Polaris all night, every night, like guards on patrol.

Moon Phases

At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). In other words, the Moon is between Earth and Sun. At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3). At full Moon, the Moon is behind Earth in space with respect to the Sun. As the Sun sets, the Moon rises with the side that faces Earth fully exposed to sunlight (5).

Today’s Sponsor

Stardate Magazine

Current Issue: MaY/JUNE 2024

The Return of IGRINS

by Emily Howard

This issue highlights the return of an instrument that studies the infrared universe, and after a decade, it’s about to come home to the McDonald Observatory in Texas. We’ll also have all the latest astronomy news, a comprehensive two-month stargazing guide for the months of May and June, detailed skycharts, and answers to your astronomy questions from our science guru Merlin.

Shopping Cart
Scroll to Top