In a borderline eclipse of the Moon like last Saturday's, the difference between "total" and "partial" depends on some crucial assumptions.
Reports describing this morning's lunar eclipse are beginning to trickle in to our offices in Cambridge, Massachusetts.
Mark your calendars for August 21, 2017 — when the Moon's umbral shadow will race coast to coast across the United States for the first time in nearly a century.
Looking at the Sun is harmful to your eyes at any time, partial eclipse or no. Fortunately, there are many easy ways to watch the show safely.
A total eclipse of the Sun is a spectacular sight. With a little preparation and advance planning, you can capture your own souvenir portrait of this awe-inspiring sight.
Using a safe solar filter, it's easy to photograph a partial solar eclipse.
Lunar eclipses are leisurely affairs a pleasure to watch and photograph.