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06/26/2018 – Ephemeris – Latest sunset of the year

June 26, 2018 Comments off

Ephemeris for Tuesday, June 26th. Today the Sun will be up for 15 hours and 33 minutes, setting at 9:32, and it will rise tomorrow at 5:59. The Moon, 2 days before full, will set at 5:42 tomorrow morning.

Today is the day of the latest sunset, at least for around latitude 45 degrees north. It will be within the same minute for the next 5 days, before it retreats. By the end of July sunset will be at 9:09 p.m. The lopsidedness of the dates of earliest sunrise and latest sunset is caused by two factors. The Sun’s high latitude or declination above the equator, which makes it appear to move faster, countered in the summer by the fact that the Earth is almost at its farthest from the Sun, which makes it appear to be slower. These effects are why sundials don’t keep proper clock time without the adjustment of the equation of time to the readout, or fancy sundials that take that into account.

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

Addendum

In a post from last year I looked at the equation of time: https://bobmoler.wordpress.com/2017/03/13/03132017-ephemeris-more-thoughts-about-yesterdays-time-change/