The Sky Today on Thursday, July 17: Mercury stands still

Mercury stands stationary at 3 A.M. EDT amid the stars of Cancer. The solar system’s smallest planet will now start sliding westward, or retrograde, appearing to “fall” back toward the Sun as it moves through its tight, 88-day orbit.  You can catch Mercury in the evening sky, but only if you’re quick — it’s justContinue reading “The Sky Today on Thursday, July 17: Mercury stands still”
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