Sept. 22 marks the fall equinox, ushering in the year’s best season on a day that lasts almost exactly 12 hours no matter where you are on the globe. It peaks on June 21 – when daylight hours are longest – and bottoms out on Dec. 21. On the equator, the rate of change is essentially zero – the day will be about 12 hours long today, and 12 hours long tomorrow, too. Washington’s losing 2 1⁄2 minutes. Where I live in Red Lake Falls, Minn., we’re losing nearly 3 1⁄2 minutes of light each day.

Source: National Post September 22, 2017 10:07 UTC