When you map out the Daylight Saving Time adjusted sunrise and sunset times over the course of the year, an interesting pattern emerges.
Chart designer Germanium writes:
I tried to come up with the reason for the daylight saving time change by just looking at the data for sunset and sunrise times. The figure represents sunset and sunrise times thought the year. It shows that the daylight saving time change marked by the lines (DLS) is keeping the sunrise time pretty much constant throughout the whole year, while making the sunset time change a lot. The spread of sunrise times as measured by the standard deviation is 42 minutes, which means that the sunrise time changes within that range the whole year, while the standard deviation for the sunset times is 1:30 hours. Whatever the argument for doing this is, it’s pretty clear that reason is to keep the sunrise time constant.
You can read more about the controversial history of Daylight Saving Time here.
Daylight Saving Time Explained [via Cool Infographics]
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