The Sky This Week from September 22 to 29: It’s time for autumn

Friday, September 22Mercury reaches greatest western elongation (18°) at 9 A.M. EDT. The solar system’s smallest planet is visible in the early-morning sky just before sunrise for the next several days, though now it will start to sink back toward the horizon earlier and earlier. If you’re up early this week, you can catch itContinue reading “The Sky This Week from September 22 to 29: It’s time for autumn”
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