Canis Major
Home of the brightest star in the sky
Best on December–February evenings · southern sky.
Canis Major, the Great Dog, follows Orion faithfully across the winter sky. It's a mid-sized constellation sitting south of the celestial equator, best known for containing Sirius — the single brightest star in the entire night sky. From northern latitudes it rides low in the south on winter evenings; from the tropics and southern hemisphere it climbs even higher.
How to find it
On winter evenings, find Orion's Belt — three evenly spaced stars in a short row — then follow that line leftward and downward toward the south. It points almost directly at Sirius, the blazing blue-white star you simply cannot mistake. The rest of Canis Major fans out below and around it, with Adhara and Wezen forming a rough triangle to Sirius's lower left.
Brightest stars
Sirius dominates at magnitude -1.46 — nearly twice as bright as any other star in the night sky and unmistakable as a hard blue-white beacon. Behind it, Adhara glows at magnitude 1.5, with yellow-white Wezen at 1.84 and Mirzam at 1.98 rounding out the brightest corners of the dog.
Worth seeing
Sirius itself is the prize — at magnitude -1.46 it blazes so intensely that it often seems to flash colors near the horizon, a real scintillation effect as its light punches through the atmosphere. Just finding it rewards any winter outing.
Frequently asked
When is Canis Major visible?
Winter evenings, roughly December through February, when it climbs into the southern sky after dark. Northern hemisphere observers see it low in the south; from the tropics and southern hemisphere it rides higher and is even more impressive.
What are the brightest stars in Canis Major?
Sirius leads at magnitude -1.46, the brightest star in the entire night sky. Adhara (1.5), Wezen (1.84), Mirzam (1.98), and Aludra (2.45) fill out the constellation's main shape.
Which hemisphere is Canis Major best seen from?
It's visible from both hemispheres, but sits south of the celestial equator, so southern hemisphere and tropical observers get the best view. Northern observers can still enjoy it low in the southern sky on winter nights.
Nearby constellations
Puppis · Columba · Orion · Eridanus · Carina · Gemini · Hydra · Cancer