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 …

Dec 20, 2025 · 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 …

Dec 4, 2025 · 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 …

Dec 15, 2025 · Research shows a full moon can modestly affect sleep, but its influence on mental health is much less certain.

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 …

4 days ago · Artemis II will send astronauts around the moon in February-April 2026, marking NASA’s first crewed lunar mission in 53 years and paving the way for lunar landings.

MoonCalc shows the motion of the Moon and Moon phase for a particular day at a particular location. You can see the moon positions for moon rising, selected time and Moonset.

A lunar phase or Moon phase is the apparent shape of the Moon 's day and night phases of the lunar day as viewed from afar. Because the Moon is tidally locked to Earth, the cycle of …

Dec 14, 2025 · Most effort hitherto had been devoted to understanding the movements of the Moon through space, but now astronomers began to focus their attention on the character of …