At 21.3N 157.816667W:
 In 2016:
  Spring begins on the March equinox at 2016-03-19 18:29:48 HST.
   Sunrise is at 06:32:58 HST, sunset is at 18:40:50 HST,
   and the day is 12 hours, 7 minutes, and 52 seconds long.
  Summer begins on the June solstice at 2016-06-20 12:33:55 HST.
   Sunrise is at 05:48:34 HST, sunset is at 19:14:27 HST,
   and the day is 13 hours, 25 minutes, and 53 seconds long.
  Fall begins on the September equinox at 2016-09-22 04:20:41 HST.
   Sunrise is at 06:18:46 HST, sunset is at 18:24:11 HST,
   and the day is 12 hours, 5 minutes, and 25 seconds long.
  Winter begins on the December solstice at 2016-12-21 00:44:00 HST.
   Sunrise is at 07:03:22 HST, sunset is at 17:53:41 HST,
   and the day is 10 hours, 50 minutes, and 19 seconds long.
 In 2017:
  Spring begins on the March equinox at 2017-03-20 00:28:31 HST.
   Sunrise is at 06:32:16 HST, sunset is at 18:41:04 HST,
   and the day is 12 hours, 8 minutes, and 48 seconds long.
  Summer begins on the June solstice at 2017-06-20 18:23:42 HST.
   Sunrise is at 05:48:31 HST, sunset is at 19:14:24 HST,
   and the day is 13 hours, 25 minutes, and 53 seconds long.
  Fall begins on the September equinox at 2017-09-22 10:01:07 HST.
   Sunrise is at 06:18:43 HST, sunset is at 18:24:25 HST,
   and the day is 12 hours, 5 minutes, and 42 seconds long.
  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.