You just have to know the date.
Sunset on March 11 over the Anacostia River in Washington. By David Policansky March 18 at 3:33 PM Would you like to know the time of sunset without consulting an almanac or a newspaper or some website? If you live in or near Washington, from February through April you can, to within a minute or two, just by knowing the date. Even in January and May, the error increases only to about 5 minutes.
I am writing this March 18, and the sunset time in March, to within about a minute, is the date in minutes past the hour. For February and April, the formula is the date in minutes past the half-hour. So on Feb. 18, sunset would be at 5:30 p.m. plus 18, which equals 5:48 p.m., and on April 18 you’d get 7:48 p.m. These times are all within about two minutes of the correct time.
In June and the first three weeks of July, we’re close enough to the solstice that the formula doesn’t work because the time of sunset changes little from day-to-day, but if you assume the sun sets at 8:32 p.m., you’ll be within 5 minutes of the right time throughout that period.
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