The Daily Parker

Politics, Weather, Photography, and the Dog

Darkest morning in 47 years

As I pointed out in the last Chicago Sunrise Chart, tomorrow morning the sun will rise in Chicago at 7:30:11, the latest sunrise in most people's lifetimes. I found only one occasion from 1975 to 2040 when the sun rises later: at 7:30:35 on 6 November 2032.

The last time the sun rose after 7:30 was at 7:31:26 on 26 February 1974, after Chicago started daylight saving time on 6 January 1974, due to the oil crisis. Chicago also observed year-round daylight saving time during World War II, from 9 February 1942 until 30 September 1945. Chicago's latest-ever sunrise occurred at 8:19:17 on 4 January 1943.

Think about that when you whine about the time change. We only get 9 hours of daylight on most December days; you really want to go to work entirely in the dark?

Comments (1) -

  • David Harper

    11/6/2021 8:04:17 AM +00:00 |

    For a couple of years in the late 1990s, I was on the staff of Her Majesty's Nautical Almanac Office.  One of my duties was to calculate sunrise and sunset times for specific places and dates at the request of lawyers or the police.  I had to write formal legal statements which would be presented as written evidence in court.  One of the caveats that I was required to include in every statement was that the calculated times of sunrise or sunset could differ by up to a minute from the actual observed times, due to variations in atmospheric refraction which depend upon local atmospheric pressure, temperature and humidity, which were, of course, unknown to me.

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