This Week’s Sky at a Glance, March 15 – 23

  Friday, March 15 • Look for Arcturus, the Spring Star, very low in the east-northeast after nightfall and higher in the east later in the evening. By modern measurements Arcturus is visual magnitude –0.05, making it the fourth-brightest nighttime star. It’s bested only by Sirius, Canopus, and Alpha Centauri (if you combine the light of Alpha Cen A and B, because the pair appears single to the unaided eye). […]

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