I've wondered this for a few years now. I have a list of local sunrise and sunset times, and I notice that, as the seasons change, sunrise and sunset times don't change symmetrically. I thought the listed times might just be wrong, but I do observe times close to these each year. Here is an example. For my location, here are some sunrise/sunset times in early winter: December 1 7:26AM 4:45PM December 15 7:39AM 4:41PM January 1 7:46AM 4:51PM January 15 7:43AM 5:06PM February 1 7:30AM 5:28PM Look at the date range December 1 to January 1 for example. During that time period, 20 minutes of daylight is lost in the morning, but 6 minutes is actually gained in the evening. Shouldn't the shortening and lengthening of days with seasons be symmetrical about local noon?