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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.

Star of the week: Aldebaran

Aldebaran – brightest star in Taurus the Bull – is huge! If it replaced our sun, its surface would extend almost to the orbit of Mercury.

Was the Christmas Star real?

Some possible astronomical explanations for the Star of Bethlehem or Christmas star.

Solstice arrives December 21

December solstice 2017 arrives on December 21 at 16:28 UTC. High summer for the Southern Hemisphere. For the Northern Hemisphere, the return of more sunlight!

Watch for Ursid meteors

Ursid meteor shower active each year around December solstice. In 2017, the peak is probably Friday morning, December 22.

Solstice tale of two cities

December solstice sunrise comes at the same time for St. Augustine, Florida and New York City. But St. Augustine has an hour more of daylight than New York. Here’s why.

Mysterious rock-comet 3200 Phaethon was closest to Earth December 16

This asteroid-comet hybrid is why the Geminid meteors put on a good show in 2017. Info and images of the rock-comet here.

Lengths of lunar months in 2017

Longest lunar month of 21st century (2001 to 2100) starts with December 18 new moon. It’s also the farthest new moon of the year. Coincidence?

Sirius in many colors

When you see the sky’s brightest star – Sirius – low in the sky, you’re seeing it shine through an extra thickness of Earth’s atmosphere. At such times, its colorful flashing might surprise you.