The Synthesis of "moon phases"

Discover the eight phases of the Moon, from New Moon to Full Moon. Learn how the lunar cycle is caused by the Moon's orbit around Earth.

Discover what happens when Earth passes between the Sun and Moon, casting a shadow that can turn our lunar neighbor a dramatic reddish color.

What is an eclipse? Discover how celestial bodies align to block light, creating spectacular solar and lunar events visible from Earth.

Discover tidal forces, the gravitational effect that stretches bodies. Learn how the Moon's gravity causes Earth's ocean tides and affects space.

Discover the equinox, the twice-yearly event when day and night are nearly equal, marking the start of spring and autumn. Learn why it happens.