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Dates of lunar and solar eclipses in 2021
Here are the dates of all solar and lunar eclipses in the year 2021. Is there one you can see? The next one is a total lunar eclipse, coming up in May.
April 20, 2021
Jupiter’s equinox and mutual events of its 4 major moons
The king planet Jupiter reaches its equinox on May 2, 2021, an event that always causes mutual events of Jupiter's 4 major moons. It's an eclipse season of the moons.
March 31, 2021
Is March’s full moon a supermoon?
The full moon on March 28, 2021, ranks as the 4th-closest (and therefore 4th-largest and 4th-brightest) of the 12 full moons of 2021. Is it a supermoon? Here's why experts disagree.
March 23, 2021
2001 FO32: Big asteroid sweeps closest this weekend
When the asteroid labeled 2001 FO32 sweeps closest to Earth on March 21, 2021, it'll be moving at such a fast pace that observers using telescopes might be able to detect its motion - its drift in front of the stars - in real time. Charts and info here.
March 19, 2021
What is a quasar?
A quasar is an extremely bright, distant object visible to radio telescopes. The source is an active galactic nucleus fueled by a supermassive black hole.
February 28, 2021
Observer’s challenge: Venus-Saturn conjunction February 6, 2021
Can you still see Venus in the east before sunrise? It's easier from Earth's Southern Hemisphere than from the northern half of the globe. If you can see it, you just might catch the furtive rendezvous of Venus and Saturn at dawn on February 6, 2021.
January 31, 2021
What do redshifts tell astronomers?
Redshifts reveal how an object is moving in space, showing otherwise-invisible planets and the movements of galaxies, and the beginnings of our universe.
January 24, 2021
How to find Delta Aquariid radiant point
How to spot the radiant point for the Delta Aquariid meteor shower, going on now. Plus ... why meteors in annual showers have radiant points.
January 24, 2021
Close and far moons of 2021
In the year 2021, the moon will swing to its farthest point from Earth on May 11, 2021, and then will come closest to Earth on December 4, 2021.
January 1, 2021
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
