During astronomical twilight, Earth’s atmosphere can refract sunlight, scattering some skyward. But when the Sun reaches 18° below the horizon, the sky is truly dark.

There is something transformational about twilight. When the sun has just set in the west, the sky changes from the vibrant blue of afternoon to a more relaxed hue, as if it’s settling down for ...

This year's pro races for the Athens Orthopedic Clinic Twilight serves as the fourth stop in USA CRITS, with the women's races starting at 7:00 p.m. EDT and the men's race at 8:30 p.m. EDT. Live ...

The Warrior Twilight Invitational was a chance for more than 500 high school cross country runners from central Pennsylvania to lace up their shoes, dust off the rust, and compete in a unique ...

Welcome to the twilight zone. It’s a real place — but under the sea. The mesopelagic zone, also known as the “twilight zone,” is a mysterious region of the ocean between 200 and 1,000 ...

DENVER — A national tour of "Twilight In Concert" will make 60 stops across the United States. The cinematic live-to-film concert experience will have a live band performing the score to the ...