Articles About December (14)
About the 12 Months
Why are there 12 months? How long are they, and what do the month names mean?
When do seasons begin and end in the two hemispheres?
2023 Cosmic Calendar
Celestial events and highlights of 2023 including supermoons, solar and lunar eclipses, meteor showers, solstices, and equinoxes.
The December solstice is the shortest day the Northern Hemisphere. South of the equator, it's the longest day.
When Does Winter Start?
Winter starts at the winter solstice. When is the winter solstice this year?
December Solstice Facts
10 things you may not know about the December solstice, the shortest day of the year in the Northern Hemisphere.
When Does Summer Start?
When is the summer solstice 2023 in the southern and northern hemispheres?
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.
June Solstice Facts
11 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.