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Find the radiant point for the Eta Aquariid meteor shower

Eta Aquariid meteors radiate from the Y-shaped group of stars called the Water Jar in the constellation Aquarius. Here are 2 ways to find it.

Comet Halley’s 2 meteor showers

It’s because comets like Halley are so crumbly that we see annual meteor showers. One shower spawned by this comet is going on now. Another is visible in October.

All you need to know: Eta Aquariid meteors

In 2018, the forecast calls for the greatest number of Eta Aquariid meteors to fall before dawn on May 5. Unfortunately, the waning gibbous moon will obscure the show, but perhaps a few of brighter Eta Aquariids can overcome the moonlight.

Our line of sight to bright planets today

This chart – from astronomer Guy Ottewell in England – shows the paths of the planets in April and May, and sightlines from Earth to them on April 29.

Do we all see the same moon phase?

One Earth. One sky. One moon phase (more or less) from all of Earth. So why (and how) does the moon look different from different parts of Earth?

Lyrid meteor shower: All you need to know

In 2018, April 22 is the peak morning. The moon, near the 1st quarter phase, is out of the way. Expect 10 to 20 meteors per hour at the peak.

Find the Lyrid meteors’ radiant point

You don’t need to find the radiant to see the meteors. But it’s fun to spot, near the bright star Vega.

April 21 is Astronomy Day

A beautiful chart from astronomer Guy Ottewell, showing the evening sky on Astronomy Day 2018. Plus links to Astronomy Day events and other info.

How the moon reveals the sun’s mass

How do astronomers determine masses for distant space objects? Here’s one example – using the moon’s orbit as a baseline to find the mass of our sun – from EarthSky’s Bruce McClure.

Come to know the Big and Little Dippers

The Big Dipper is easy. And, once you find it, you can find the Little Dipper, too.