Monday, September 15, 2025

Saturn at its brightest, a solar eclipse, and September's celestial highlights

From the Great Square of Pegasus to a deep partial eclipse, this week offers many skywatching treats
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September 15, 2025
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Night Sky This Week
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What's Up This Week?
 
Hello skywatchers!

Mid-September skies are packed with variety — from classic star patterns to planetary showpieces and even a solar eclipse. The week begins with the Great Square of Pegasus rising in the east, a sign that autumn stargazing season is on the way. Each dawn brings a delicate crescent moon mingling with Venus, Jupiter, and the Beehive Cluster, while predawn skies also favor views of the elusive zodiacal light. On Saturday, Saturn reaches opposition, shining at its very brightest for the year. Then Sunday closes the week with a new moon that delivers a dramatic partial solar eclipse across New Zealand, Polynesia, and Antarctica.

Here's what to watch for this week.

Clear skies,

Daisy
Reference Editor, Space.com

 
 
Monday, Sept. 15 — The Great Square of Pegasus (all night)
(Starry Night)
Monday, Sept. 15 — The Great Square of Pegasus (all night)
Look east after dark for the Great Square of Pegasus, a four-star diamond that's one of the most recognizable autumn asterisms. To the Lakota, it represented Keya the Turtle; to the Anishinaabe, Mooz the Moose. Under suburban skies, the square may appear empty, but binoculars reveal hidden stars — including two that form the "moose's heart."
Full Story: Space (10/1)
 
Tuesday, Sept. 16 — Crescent moon meets Jupiter over Venus (predawn)
(Starry Night)
Tuesday, Sept. 16 — Crescent moon meets Jupiter over Venus (predawn)

Before sunrise, a waning crescent moon shines near bright Jupiter in Gemini, with brilliant Venus glowing lower on the horizon. Castor and Pollux complete the scene for an early-morning photo opportunity.

Full Story: Space (10/1)
 
Wednesday, Sept. 17 — Old moon approaches the Beehive (predawn)
(Starry Night)
Wednesday, Sept. 17 — Old moon approaches the Beehive (predawn)
The crescent moon slips between Venus and Jupiter while hovering above the Beehive Cluster (Messier 44). Use binoculars to catch the cluster's scattered "bees" twinkling below the moon.
Full Story: Space (10/1)
 
Thursday, Sept. 18 — Morning zodiacal light (predawn)
(Starry Night)
Thursday, Sept. 18 — Morning zodiacal light (predawn)
Look east before dawn for a faint, triangular glow of zodiacal light rising above Venus. This ghostly glow is sunlight scattering off interplanetary dust — best seen under dark skies away from city lights.
Full Story: Space (10/1)
 
Friday, Sept. 19 — Venus gleams between the crescent moon and Regulus (predawn)
(Starry Night)
Friday, Sept. 19 — Venus gleams between the crescent moon and Regulus (predawn)
Venus appears neatly framed between the old crescent moon above and Regulus below. In parts of northeastern Canada, Greenland, Europe, and northern Africa, the moon will occult Venus or Regulus in daylight — a rare celestial treat.
Full Story: Space (10/1)
 
Saturday, Sept. 20 — Saturn at opposition (all night)
(Starry Night)
Saturday, Sept. 20 — Saturn at opposition (all night)
Saturn rises at sunset and shines all night at its brightest of 2025. Through a telescope, its rings span 45 arcseconds and shine even more brilliantly thanks to the Seeliger effect — sunlight reflecting directly back from the ring particles. Opposition is also a prime time to spot Saturn's moons.
Full Story: Space (10/1)
 
Sunday, Sept. 21 — New moon and partial solar eclipse
(Starry Night)
Sunday, Sept. 21 — New moon and partial solar eclipse

The new moon aligns with the sun at 19:54 GMT, bringing a deep partial solar eclipse visible from New Zealand, Polynesia, Melanesia, and Antarctica. At the greatest eclipse, nearly 79% of the sun will be covered over Dunedin, New Zealand. Remember: solar filters are essential for safe viewing.

 
Full Story: Space (10/1)
 
 
 
 
Moon Calendar
 
Space.com
Notable Moon Phase This Week: New Moon & Partial Solar Eclipse

The new moon on Sunday, Sept. 21, not only darkens the skies for deep-sky observing but also delivers a partial solar eclipse. While only visible from the South Pacific and Antarctica, it's a reminder of how special these alignments are. For those outside the eclipse zone, enjoy the moon's reset as it prepares to return to the evening sky as a crescent.

Want to explore more? Check out our ultimate guide to observing the moon for tips and tools to get the most out of each phase.

 
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