A riff on one of my first infographics, sunrise/sunset. The sunlit (and twilit) hours for Boston over the course of the year are plotted. You can see summer as the bulge in the middle, with its early morning light and late evenings. The current day is marked by the tall vertial line.

What's new (besides removing some of the graph lines and month markers) is the second level graph overlayed, showing how just how much the sunrise or sunset has shifted over the course of the week. At the summer and winter solstice, there is little change day after day, and the graph is near zero. Near the spring and fall equinox however change is rapid.

Interesting that the Earth's wobble makes it assymetrical - The week over week increase in daylight in Spring proceeds more rapidly than the loss of daylight in the Autumn...

You can experiment with the source code yourself!