About: John Mosley

John Mosley was Program Supervisor of the Griffith Observatory in Los Angeles for 27 years and is the author of “Stargazing for Beginners” and “Stargazing with Binoculars and Telescopes”. He and his wife live in St. George where he continues to stargaze from his retirement home while serving on the advisory committee for Stellar Vista Observatory.


Recent Posts by John Mosley

Jul 4

Sky Report: July 5 – July 11

This is the last week until late December that all five naked eye planets will be visible on the same night, so here’s where they are. Venus and Mars are near each other low in the west in the evening sky. Venus is brilliant and you can’t miss it but Mars is only 1/200th as […]

Jun 27

Sky Report: June 28 – July 4

Once again all five naked-eye planets are visible and will be for the following week, so we’ll begin with Venus in the evening sky and end with Mercury in the morning. Venus is brilliant in the west, as it will be all summer. It’s on the far side of the sun but it orbits the […]

Jun 20

Sky Report: June 21 – June 27

We’ll do another rundown of the planets. Venus was behind the sun in March, and since then it’s been moving left-ward away from the sun, where it sets later each night and becomes easier to see. It now sets 90 minutes after the sun and is moderately low in the west during evening twilight. It […]

Jun 13

Sky Report: June 14 – June 20

The first planet to appear tonight is Venus, poetically called the Evening Star. You can see it during twilight north of due west and fairly low. Venus is so brilliant that you can see it at sunset – and even before — if you know where to look; find it one night, and then the […]

Jun 6

Sky Report: June 7 – June 13

The good news is that there is a rare “annular” or ring eclipse of the sun on June 10 — but the bad news is that you won’t see it unless you’re in a small part of Russia, Greenland, or northernmost Canada. It will be a nice partial eclipse for some eastern states and much […]

Jun 2

Sky Report: May 31 – June 6

This week we’ll recap what the moon and planets are doing. Two planets are in the evening sky and two are in the morning. Brightest of all is Venus, which is becoming very slightly easier to see day by day. It’s presently on the far side of the sun where it’s only 20° to the […]

May 23

Sky Report: May 24 – May 30

This week’s main event is a total eclipse of the moon on the morning of Wednesday, May 26. A total eclipse of the moon happens when the full moon moves through the shadow of the earth and grows dark. Everyone on the side of the earth that faces the moon can watch the eclipse simultaneously. […]

May 17

Sky Report: May 17 – May 23

This is the final week that all five planets are visible. Mercury is low in the west after sunset, where it has been all month, but this week it leaves us. A few weeks ago Mercury was on the far side of the sun and approaching us in a big arc. On the 27th it’s […]

May 9

Sky Report: May 10 – May 16

This is the best week of the entire year to see the elusive planet Mercury as it achieves it’s greatest angular distance from the sun, 22°, on the 17th. You should easily see it without binoculars, but you do need a low northwestern horizon, important to see Mercury but essential to see Venus just below. […]

May 2

Sky Report: May 3 – May 9

This week and the next two all five naked eye planets are visible at one time or another, beginning with Venus and Mercury. Both are very low in the west-northwest at sunset, and the trick is that 1) you need to look immediately after sunset, 2) you need a flat, low horizon, and 3) binoculars […]


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