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Lengths of lunar months in 2018

This new moon ends the longest lunar month of the 21st century and begins the longest lunar month of 2018.

Best photos: Morning planets!

On Sunday morning, Jupiter and Mars were half a moon-diameter apart. Now the moon is sweeping past. Plus Mercury and Saturn are in conjunction this weekend. Photos here.

Close and far moons in 2018

In 2018, the moon swings farthest from Earth for the year on January 15, only 2 weeks after coming closest to Earth for the year on January 1.

EarthSky’s 2018 meteor shower guide

Plan ahead now for an awesome year of meteor-watching. Good news! In 2018, the year’s 2 most reliable showers – August Perseids and December Geminids – happen with little to no interference from the moon.

Sun in zodiac constellations, 2018

Sun-entry dates to zodiac constellations in 2018, using boundaries for constellations set by International Astronomical Union in 1930s.

How to translate UTC to your time

The Earth has 24 time zones. Look here to learn how to translate UTC to your local time zone.

Are December’s solstice and January’s perihelion related?

December solstice 2017 was December 21. Earth is closest to the sun for 2018 on January 2-3. Coincidence?

Super effect on us from supermoons?

A supermoon’s extra pull of gravity creates higher-than-usual tides. But the moon’s pull doesn’t affect a human body nearly as powerfully as it does an ocean.

Moonlight for 2018 Quadrantid meteors

The 2018 Quadrantid meteor shower is expected to exhibit its narrow peak January 3 around 21-22 hours UTC. The full supermoon nearly coincides, and moonlight will interfere with the shower.

See brightest star Sirius at midnight on New Year’s Eve

Dog Star Sirius reaches its highest point in the sky around midnight every New Year. For this reason, it might also be called the New Year’s star.