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06/15/2020 – Ephemeris – Now is the date of the earliest sunrise and it isn’t even summer yet

June 15, 2020 Comments off

This is Ephemeris for Monday, June 15th. Today the Sun will be up for 15 hours and 33 minutes, setting at 9:30, and it will rise tomorrow at 5:56. The Moon, 2 days past last quarter, will rise at 3:30 tomorrow morning.

Today, give or take a day is the date of the earliest sunrise. The latest sunrise was about January 2nd, leaving only about 165 days for the transition of three hours, 24 minutes and since we still have five days to the longest day. The sunset change rate is a lot more leisurely. It has to do with the tilt of Earth’s axis and its slightly elliptical orbit. It’s why sundials don’t keep proper time. Though most sundials appear to be decorative and are not set up correctly anyway. Besides sundials can’t cope with time zones, and daylight time unless they are specially built for a particular location. Anyway the latest sunset will be on the 26th, 200 days since the earliest sunset, on December 9th, last year.  The sunset retreat to December 9th will take 165 days, and the sunrise advance will take 200 days until next January 2nd next year.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.