Growing darkness: How it really works

Of course you’ve noticed that we have less daylight than we did in July. Maybe you listen to public radio and hear the meteorologist recite the number of hours and minutes of sunshine today. Then he adds, “It’s a decrease of two minutes from yesterday.” Yet the next day he might say that there’s only a one-minute decrease, or a three-minute decrease. It seems to jump around. Let’s get to the bottom of this.

This weekend, the Sun rises at around 6 a.m. and sets around 8 p.m. We get roughly 14 . . .

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