A solar eclipse happens at the new moon – when the moon passes between the sun and Earth. A lunar eclipse happens when the Earth, sun and moon align in space, with Earth in the middle. Why aren’t there eclipses at every full and new moon?
No matter what the weather where you are, enjoy these photos from EarthSky friends on Facebook and G+.
So far to the south as to be unfamiliar to the ancient Greeks and Romans, this star does not have a classical name. It is Beta Crucis, the second star of the Southern Cross.
Happy birthday April babies! Your birthstone, the diamond, is the rich cousin of graphite.
With the onset of spring in the Northern Hemisphere, animals that hibernate are waking up from a long-period of deep sleep. They spent the winter hibernating to conserve energy when food was scarce.
If you’re in just the right spot on Earth, you might observe the eclipsed moon setting while the sun rises – or the eclipsed moon rising while the sun sets – on Saturday, April 4. This is called a selenelion. Celestial geometry says should not happen, but it does happen. We tell you why – and provide a chart of who will see the selenelion on Saturday – inside.
Tonight … learn and use the most useful star mnemonic you’ll ever encounter. It’s … follow the arc to Arcturus and drive a spike to Spica. Scouts learn this phrase. Grandparents teach it to kids. Arcturus and Spica are so bright that you can often see them on a moonlit night – like tonight. Follow the links inside to learn more.
Three planets easy to see throughout April 2015. Venus and Jupiter at nightfall. Saturn late evening on. Mercury joins in mid-month for its best northern apparition of the year in the evening sky.