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On November 19, 2021 (late evening of the 18th in some time zones), the Moon passes into the shadow of the Earth, creating a partial lunar eclipse so deep that it can reasonably be called almost total. It’s actually the longest partial lunar eclipse in a millennium, clocking in at 3 hours, 28 minutes and 23 seconds. There hasn’t been a longer partial lunar eclipse since February 18, 1440 (3 hours, 28 minutes, 46 seconds) and it will remain the longest partial lunar eclipse for 648 years until February 8, 2669 (3 hours, 30 minutes, and 2 seconds). There will be a longer total lunar eclipse on November 8, 2022. (text from NASA)
