Duration of Daylight
See the duration of daylight, graphed per-day for the current year, at a given location in the United States by specifying the state and city below.
U.S. Naval Observatory data services have been turned off until May 2020. See their website for details. I was using that as a data source and so the functionality of this page is currently down for most locations while I look for a new data source. In the meantime, data I have cached from previous years is shown where available. My apologies.
Learn MoreThe earth's motion about the sun is not nearly so tidy as a simple ellipse. The movement is actually quite crazy and takes sustained study (or a really good teacher) to fully grasp.