In geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of Earth's (about as …

6 days ago · Moon, Earth’s sole natural satellite and nearest celestial body. Known since prehistoric times, it is the brightest object in the sky after the Sun. Its name in English, like that …

Dec 17, 2025 · The Earth and Moon are tidally locked. Their rotations are so in sync we only see one side of the Moon. Humans didn't see the lunar far side until a Soviet spacecraft flew past …

A Moon cycle, or a lunation, is the time the Moon travels through its lunar phases. ©timeanddate.com Your January 2026 Moon guide Skywatching tips for January 2026’s must …

Jan 3, 2026 · What is the Moon Phase today? Use our 2023 Moon Phase Calendar to find dates and times of the full Moon, new Moon, and every phase in between. Beyond the phases of the …

The Moon: Complete and live astronomy data, visibility information, sky charts, graphs, and tools for sky-watchers at all levels.

What is the moon made of, and how did it form? Learn about the moon's violent origins, how its phases shaped the earliest calendars, and how humans first explored Earth's only natural …

Explore the current phase of the moon, its rise and set times, nightly motion across the sky, and discover lunar features with our interactive map. Stay informed about the celestial movements …

The moon and sun share top billing in 2026. Kicking off the year's cosmic wonders is the moon, drawing the first astronauts to visit in more than 50 years.

Earth's Moon is the only place beyond Earth where humans have set foot, so far. Earth's only natural satellite is simply called "the Moon" because people didn't know other moons existed …