The University of Texas Mc Donald Observatory: Moon Phase Calculator

The moon is up at night the same amount of time it is up during the day. The video discusses why the moon has phases, how even ancient people knew it was a sphere, and each moon phase. It focuses on each moon phase individually, not only...

Discover interesting facts about Earth's partner, the moon, which is more like a double planet than a planet and a moon.

Learn interesting facts about the planet Uranus and its unique history.

Learn interesting information about the Earth, the largest of the "terrestrial" planets.

View a selection of familiar constellations while learning about Zodiac signs and how constellations got their names.

Discover interesting facts about Neptune, the fourth-largest planet.

Discover interesting facts about Jupiter, the largest planet in the solar system.

Discover interesting facts about Mars, the furthest planet from the sun.

Discover interesting facts about Venus, the hottest planet and the second planet from the Sun.

Discover interesting facts about the tiny planet Mercury, the closest planet to the Sun.