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Lengths of lunar months 2021
Lunar months are the time between successive new moons. A lunar month is also called a lunation or a synodic month.
January 1, 2021
Sun’s entry into zodiac constellations, 2021
The sun entered the constellation Sagittarius on December 18, 2020. It'll cross into the constellation Capricornus on January 19, 2021. Look here for dates of the sun's entry into the zodiacal constellations for 2021.
December 28, 2020
Your photos of 2020’s historic Jupiter-Saturn conjunction
Jupiter and Saturn's great conjunction - where they appeared exceedingly close on the sky's dome - was December 21. Thank you to EarthSky community members from around the world who captured photos!
December 22, 2020
All you need to know: 2020’s great conjunction of Jupiter and Saturn
Jupiter and Saturn at conjunction are only 0.1 degree apart. Don't miss them! Info, charts, photos here.
December 21, 2020
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.
December 19, 2020
Find the Geminids’ radiant point
Why is the Geminid meteor shower best around 2 a.m.? It's because that's when the shower's radiant point - near the bright star Castor in the constellation Gemini - is highest in the sky.
December 11, 2020
South American total solar eclipse December 14
The new moon moves in front of the sun on December 14, 2020, to present this year's one and only total eclipse of the sun.
December 9, 2020
A magnified view of Jupiter and Saturn at conjunction
On December 21, 2020, Jupiter and Saturn will be only 1/5 of a moon-diameter apart! Guy Ottewell offers insights and charts showing a magnified (telescopic) view of their once-in-20-years great conjunction.
November 30, 2020
What is a supernova?
A supernova is a star's colossal explosion at the end of its life, potentially outshining its entire galaxy. Read about the causes and types of supernovae here.
November 12, 2020
Jupiter gives us Pluto in 2020
The 3rd of this year's 3 Jupiter-Pluto conjunctions is coming up on November 12, 2020. Jupiter won't have another conjunction with Pluto again until February 4, 2033. And another one this good? Not for centuries.
November 4, 2020
