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New calculations have narrowed the reentry window for Tiangong-1 to
sixteen thirty-six hours, centered at 6:30 am (Eastern) on April 1. This means reentry could come anytime during the 11 or so orbits from 10:30 pm (Eastern) on Saturday March 31 to 4:30 pm (Eastern) on Sunday April 1.
This post was incorrect, as the estimate was really 32 hours centered on 6:30 am (Eastern on April 1st, not 16. See my more recent post with an update.