Diminishing daylight and Jupiter in the evening

Traffic builds on the Rowan Street Bridge just before sunset in Fayetteville on July 22, 2021. Sunset is at 7:44 pm on September 1, but changes to 6:54 pm on September 30.  An hour of daylight during the month.

Everyone knows about the sudden change in sunset times every hour on the clock with the resulting early darkness when we go back to standard time in early November.

But now there is a gradual loss of daylight.

Between September 1 and the end of the month, we lose an hour of daylight. We lose a little over an hour in October. This slow loss of daylight leads to the shortest daylight period of the year – the winter solstice on December 21 – when Fayetteville’s daylight period is as short as nine hours and 48 minutes.

September also comes with the autumnal equinox on September 22, which marks the beginning of fall in the northern hemisphere and spring south of the equator.

The equinox means “equal night” and the hours of the day and night are assumed to be equal in length at the equinox.

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