Monday, September 8, 2025

The moon dances with planetary partners ahead of its third quarter phase: Sept. 8 - 14

From lunar rendezvous to famous asterisms, here's what the night sky has in store for the next week
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September 8, 2025
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Night Sky This Week
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What's Up This Week?
 
Hello skywatchers!

The spectacle of Sunday's blood moon total lunar eclipse may be behind us, but there's still plenty to look forward to over the coming week. Monday will see the moon — still the center of attention — hang out with the ringed giant Saturn above the eastern horizon as dusk gives way to night, with the ice giant Neptune close at hand. The three prominent stars of the famous Summer Triangle asterism are also set to put on a show shining alongside the Milky Way in mid-September, while Sunday will see the half-lit moon grace the early morning sky as it reaches its third quarter phase on Sept. 14. 

Here's what to watch for this week.

Clear skies,
Anthony Wood
Sky Watching Writer, Space.com
 
A simulation of the night sky for Sept. 8 showing the moon close to the eastern horizon, with Neptune and Saturn on its right.
(Starry Night.)
Monday, Sept. 8 — Bright Moon Near Saturn and Neptune (Evening)
Catch the moon shining with the amber dot of the gas giant Saturn close to its right above the eastern horizon after sunset on Sept. 8, with Neptune —too dim to see with the naked eye — located directly between.
Full Story: Space (10/1)
 
A simulation of the night sky for Sept. 11 showing the three stars of the summer triangle joined by a blue line to form a triangle, with the glowing band of the Milky Way running through its center
(Starry Night)
Thursday, Sept. 11 — The Summer Triangle (All Night)
September is a great time to observe the magnificent stars of the Summer Triangle asterism — Vega, Altair and Deneb — shining alongside the glowing ribbon of the Milky Way in the southeastern sky at dusk.
Full Story: Space (10/1)
 
A simulation of the night sky for Sept. 12 showing the half-lit moon close to the horizon with the Pleiades to its upper right, and Uranus below to the right. The moon and Pleiades are surrounded by a yellow circle indicating the field of view of a pair of binoculars
(Starry Night)
Friday, Sept. 12 — Moon Near The Pleiades And Uranus (Overnight)
The waning gibbous moon will be visible close to the blue-white stars of the Pleiades open cluster on Sept. 12, with Uranus lurking in a patch of sky approximately 5 degrees to the lower right of the lunar disk.
Full Story: Space (10/1)
 
A simulation of the night sky for Sept. 13 showing Mars close to the western horizon with the bright star Spica below. The rest of the stars of the constellation Virgo are visible above, connected by a blue line.
(Starry Night)
Saturday, Sept. 13 — Mars Passes Spica (After Sunset)
Red Mars shines close to the bright blue star Spica in the constellation Virgo at sunset on Sept. 13, but you'll need a clear view of the horizon to catch the colorful duo before they slip swiftly below the horizon.
Full Story: Space (10/1)
 
A graphic of the full moon with its left side lit by sunlight and its right bathed in darkness while hanging against a black starry sky.
(Starry Night)
Sunday, Sept. 14 — Third Quarter Moon
The moon reaches its third quarter phase at 6:33 a.m. EDT (1033 GMT) on Sept. 14. The hours preceding dawn will see the lunar disk appear with its left half lit by direct sunlight and its right bathed in shadow close to the bright star Elnath above the southeastern horizon.
Full Story: Space (10/1)
 
 
 
 
Moon Calendar
 
Space.com
Notable Moon Phase This Week: The Third Quarter Moon
The third quarter moon will rise around midnight on Sunday, Sept. 14, with its left half glowing in the light of the sun and its right veiled in darkness, marking a great opportunity to explore the shadow-drenched craters thrown into relief along the terminator, the line that separates lunar day from night. The Copernicus and Kepler impact craters also make for a spectacular sight around the last quarter phase, marking the dark expanse of Oceanus Procellarum.
Full Story: Space (2/22)
 
 
 
 
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