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Coming Up in December

Nights are at their darkest in the Northern Hemisphere, and the Full Moon rides high in the sky. Meanwhile, the Southern Hemisphere enjoys long, bright evenings.

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Illustration of the solar system showing planets in order from the Sun to Saturn.
Planet Sizes and Order

With surface gravity, moons, current phase, type, and more.

Illustration of Earth and Saturn with a ruler between them, representing measurement or distance in space.
Who’s Closest Right Now?

Play with our timeline to see the swings in the planets’ distances from Earth.

Illustration showing the Moon orbiting Earth in Space.
Moon Phase and Position

Find the Moon’s illumination, distance, and latitude for any time on any date.

Illustration of a meteor shower
Meteor Showers

Check the best dates and timings to see shooting stars from your location.
An image of the solar system showing the alignment of the Earth, Jupiter, and Saturn for the Great Conjunction of 2020.
What Is a Conjunction?

Two astronomical bodies appear to meet in the sky—but it’s an illusion.
Illustration of two people watching a bright comet streaking across a starry night sky over a mountainous landscape.
What Are Comets?

Icy leftovers from the birth of the solar system.