![]() ![]() A unique and beautiful poster-sized calendar showing phases of the moon every night of the year. ![]() Now on sale! The 2023 EarthSky lunar calendar. The shimmering and color changes happen for other stars, too, but these effects are more noticeable for Sirius because Sirius is so bright. The varying density and temperature of Earth’s air affect starlight, especially when we’re seeing the star low in the sky. In fact, these changes are simply what happens when such a bright star as Sirius shines through the blanket of Earth’s atmosphere. ![]() The brightness, twinkling and color changes sometimes prompt people to report Sirius as a UFO! The flickering colors are especially easy to notice when you spot Sirius low in the sky. It’s a flashy rainbow starĪlthough white to blue-white in color, Sirius might be called a rainbow star, as it often flickers with many colors. It’s always easy to spot as the brightest point of light in its region of sky (unless a planet happens to be near it, which none are in early 2023). From the Southern Hemisphere, it swings high overhead. From the Northern Hemisphere, Sirius arcs across in the southern sky. As part of the constellation Canis Major the Greater Dog, Sirius also earns the nickname of the Dog Star. Thank you, Garth!įebruary is perfect for both Northern Hemisphere and Southern Hemisphere observers to view the brightest star in the sky: Sirius. Orion’s Belt – the short, straight row of 3 medium-bright stars – always points to it. That’s because it’s the sky’s brightest star. | Garth Battista was in New York’s Catskill Mountains – at Manhattan Country School – when he captured the easy-to-see constellation Orion and the star Sirius (far left). ![]()
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