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At 21.3N 157.816667W:
 In 2016:
...
  Winter begins on the December solstice at 2017-12-21 06:27:50 HST.
   Sunrise is at 07:03:15 HST, sunset is at 17:53:33 HST,
   and the day is 10 hours, 50 minutes, and 18 seconds long.

#!/usr/bin/env perl
use warnings;
...
        print "   and the day is $dur long.\n";
    }
}