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View Full Version : Longest and Shortest Day Length in Chicago

Broomstick
03-14-2010, 01:18 PM
Just wondering - what is the length of daylight in Chicago on the shortest and longest days of the year? Inquiring vampires want to know.

Broomstick
03-15-2010, 02:09 PM
Bump.

There's no answer to this? Seriously, I did try to look this up, but while I find ample explanations that the solstice is the longest/shortest day of the year I don't seem to find anywhere how long the daylight part of the solstice (either one) is. I would think that, barring a few milliseconds, it would be the same from year to year.

Cunctator
03-15-2010, 04:33 PM
You could check with the local observatory. I assume there's one in Chicago.

jnglmassiv
03-15-2010, 04:54 PM
Link 1 (http://www.timeanddate.com/worldclock/astronomy.html?n=64&month=6&year=2010&obj=sun&afl=-11&day=1) Longest day = 15h 13m 31s
Link 2 (http://www.timeanddate.com/worldclock/astronomy.html?n=64&month=12&year=2010&obj=sun&afl=-11&day=1) Shortest day = 9h 07m 54s

03-26-2010, 08:48 PM
http://aa.usno.navy.mil/data/docs/RS_OneYear.php

This site will give you the sunrise and sunset times for one year. I've used it many times, wondering when sunset was going to get past 5:00. (Answer: For 2010, it was January 27, and it will get earlier than 5 on October 21 [except that we'll still be in daylight saving time then.) Running some calculations gives 15:14 as the longest day length and the shortest as 9:08, which agrees with the previous post.