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Astronomy Essentials

Meteor via Cumbrian Sky
Tonight | Dec 06, 2012

Ten tips for watching the Geminid meteor shower

Here are 10 tips for watching the 2012 Geminid meteor shower, peaking on the nights of December 13 and 14.

Jupiter's Great Red Spot
Tonight | Nov 30, 2012

Earth and Jupiter will be closer on December 1, 2012 than until 2021

Jupiter is always closest around the time of its yearly opposition, which comes on December 2-3, 2012. Jupiter will remain close and bright throughout December and January 2013.

Leonids via NASA
Tonight | Nov 14, 2012

Everything you need to know: Leonid meteor shower 2012

The famous Leonid meteor shower is nearing its annual peak. Here’s all you need to know to watch the 2012 Leonid shower.

pumpkin_300
Tonight | Oct 31, 2012

Halloween derived from ancient Celtic cross-quarter day

Yes, Halloween is an astronomical holiday.

Photo Credit: Arby Reed
Tonight | Oct 28, 2012

Looking for a tide almanac? EarthSky recommends …

The tide almanacs recommended here are based on astronomical influences on the tides. They can help you know when to expect high and low tides.

Wikimedia Commons, Paul Stansifer, User:84
Tonight | Oct 15, 2012

How far is a light-year?

Light is the fastest-moving stuff in the universe. It travels at an incredible 300,000 kilometers (186,000 miles) per second. So, in a year, light travels far.

Photo Credit: Faulkes Telescope
Tonight | Sep 09, 2012

Everything you need to know: zodiacal light or false dawn

It’s an eerie light extending up from the horizon. In autumn, you’re most likely to see it about an hour before true dawn begins.

View of galactic center from VLT
Blogs | Aug 18, 2012

What is the apogalacticon?

The apogalacticon marks where the sun is farthest from the heart of the Milky Way on its 250 million year orbit around the galactic center.

Radar images of asteroid 1999 RQ 36
Blogs | Jul 20, 2012

The Yarkovsky effect: Pushing asteroids around with sunlight

One ounce of force from an imbalance in sunlight can steer asteroids into Earth-crossing orbits and drastically alter the layout of the solar system.

galaxy_plane_ecliptic-redo
Tonight | Jul 19, 2012

Will Earth cross the galactic equator in 2012?

Earth won’t physically cross the plane of our Milky Way galaxy in 2012. But Earth does cross the galactic equator in 2012. That’s something we do every year – twice.