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This cache is about 1500 feet west of the 150 00.000 degree longitude line. That longitude is exactly ten twenty-fourths of the way around the earth from Greenwich Observatory in England. The global time zone system is designed around the theory of dividing the earth into 24 time zones, with an hour change in time for every 15 degrees of longitude as the sunlight goes around the earth from east to west. The time in each time zone is set when the sun is at its highest point during the day called "high noon".
Since Anchorage is on the 150 degree longitude, it is exactly 10 time zones behind Greenwich Observatory. However, the time zone is legally set as “Alaska Time”, which is 9 hours behind Greenwich. So “high noon” in Anchorage is actually an hour later than noon on the clock. Anchorage is naturally on the “Hawaii Time Zone” 10 hours behind Greenwich. Thus in the dead of winter, sunrise is not until 10:00 am but sunset is at 4:00 pm – two hours more daylight in the afternoon than in the morning.
As a practical matter, the sunlight in Anchorage varies so much through the year – from 6 hours in December to 18 hours in June, that most Alaskan residents are just acclimated to a disconnect between the clock and sunlight.