Articles About December (14)
About the 12 Months
Why are there 12 months? How long are they, and what do the month names mean?
Defining Seasons
When do seasons begin and end in the two hemispheres?
Astro Events 2025
When, where, and how to see things happening in the sky and space.
December Solstice
December solstice marks the shortest day north of the equator and the longest day in the south.
When Does Winter Start?
The first day of winter in the Northern Hemisphere is in December; south of the equator, it is in June. Find out exactly when the winter season starts.
10 Facts about the December Solstice
Here are 10 things about the December solstice you might not know.
When Does Summer Start?
Find out the exact moment of the summer solstice in both the Northern and Southern Hemispheres—down to the minute.
The Month of December
December is the twelfth month of the year and has 31 days. It was originally the tenth month of the Roman calendar until 153 BCE.
December: Cold Moon
The December Full Moon is called the Cold Moon, Long Nights Moon, the Moon before Yule, Oak Moon, and Wolf Moon.
December Solstice Customs
Learn more about the customs, traditions and events surrounding the December solstice.
10 Facts about the June Solstice
10 things you may not know about the June solstice.
All about Comet ISON
Everything you need to know about Comet ISON or C/2012 S1.
Brightest Comet of 2018
Comet 46P/Wirtanen will grace the night sky in December 2018. Find when, how, and where to see the brightest comet of the year with your naked eyes.
Dec 6: Minute of Global Darkness
There's a moment each year when almost 9 in 10 people worldwide experience night.