Summer solstice on June 20 at 4:51 p.m. ET is earliest since 1796 due to calendar discrepancy of 365 days vs. 365.24 days, causing solstices to drift earlier.
Leap day every four years adjusts Gregorian calendar, causing solstices to shift about 45 minutes earlier annually. By 2060s, they will be even earlier than 1700s.
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