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 wide as the …

6 days ago · Like Earth, the Moon has a day side and a night side, which change as the Moon rotates. The Sun always illuminates half of the Moon while the other half remains dark.

Find the Moon’s illumination, distance, and latitude for any time on any date. The Moon has four primary and four intermediate lunar phases during a lunar month. Here's all you need to know about each …

May 23, 2025 · Discover interesting facts about how the moon formed, what it's made out of, and the many missions humans have launched to explore it.

Sep 7, 2023 · How big is the Moon? The Moon is Earth’s only permanent natural satellite, and it’s the fifth-largest satellite in our solar system. The Moon’s diameter is approximately 2,160 miles (3,475...

3 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 of Earth, is of …

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

4 days ago · In the U.S., the New Moon occurs tonight, Dec. 19, when the Moon is nearly invisible in the night sky, ending the waning crescent phase and beginning a new lunar cycle. However, in other …

Dec 13, 2025 · The Moon is a natural body that orbits our Sun; without it, our planet would be unstable and have no tides. It is vital for our survival.

Complete Sun and Moon Data for One Day This data service provides rise, set, and transit times for the Sun and Moon, civil twilight beginning and end times , and lunar phase information for any year …