Tonight

Orion’s Belt points to Sirius on September mornings

Chart of Orion with a red arrow leading from the Belt of Orion to Sirius.
Sirius is the sky’s brightest star. And, no matter when you look for it, you can always be sure you’re looking at the correct bright star by drawing a line from Orion’s Belt to Sirius. From the Southern Hemisphere, turn the chart upside down.

Orion’s Belt points to Sirius

It’s one of the neatest tricks in all the heavens: Orion’s Belt points to Sirius, the sky’s brightest star. So on September mornings, you’ll find both Orion the Hunter and the very bright star Sirius in the eastern part of the sky before dawn. Before you know it, they’ll be shifting into the evening sky. Identify them now, and enjoy them for months to come.

Also, sometimes there are bright planets that might outshine even Sirius, in the same region. In fact, in September 2025, Venus and Jupiter are also in the morning sky and definitely outshine our brightest star.

What’s more, sometimes there are bright planets in the evening sky during the northern winter, when Orion and Sirius shine brightly. And those planets, too, might be brighter than the sky’s brightest star. In those cases, how can you be sure the object you’re looking at is Sirius? The constellation Orion is your ticket. No matter where you are, no matter what time of the year it is, Orion’s Belt always points to Sirius.

Flying into Orion’s Belt at 0.001c ?The hunter isn’t flat. It’s a real 3D region of space. (Upgraded animation!) #astronomy ?

Tony Dunn (@tony873004.bsky.social) 2026-01-06T13:45:46.332Z

Orion returned to the morning sky in late July

Orion returned to the sky before dawn in late July and early August. In September, you can easily find this large constellation before sunup. Just look in the eastern part of the sky. You’ll easily notice Orion’s Belt, which consists of a short, straight row of three medium-bright stars.

To find Sirius, draw a line through Orion’s Belt and extend that line toward the horizon. There, you’ll spot Sirius, the sky’s brightest star.

Sirius is in the constellation Canis Major the Greater Dog. It’s often called the Dog Star.

High, wide array of bright but slightly fuzzy stars, and one extra-bright one near the horizon.
View at EarthSky Community Photos. | Sergei Timofeevski shared this image from November 13, 2023. Sergei wrote: “The constellation Orion the Hunter and the star Sirius rising just above the eastern horizon in the Anza-Borrego Desert State Park, California.” Thank you, Sergei! Note bright Sirius is on the bottom, and Orion’s Belt is pointing to it.

Bottom line: Sirius is the sky’s brightest star. But sometimes bright planets outshine it. Orion’s Belt is your ticket to identifying Sirius.

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Posted 
September 16, 2025
 in 
Tonight

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