Sounds like another simplification that will make things more complicated. The thing is, while the relative length of dark and light may vary, the time it takes to make a full rotation is constant, whether you stand at the equator or at a pole. Now, it's true that the farther you get outside the tropics the more variance there will be in the length of the daily light and dark periods, but nevertheless, the circadian rhythm responds to it similarly the world over. You think the day after the daylight savings changes would be bad for traffic? Imagine that happening every day? I remember how hard my mom had to work to get my brother and I to go to bed at a reasonable hour in the summer when it stayed light until 9:30, but imaging how bad it would be if it cycled around all year.
No, a rational calendar would be nice, but this idea has a fundamental flaw.
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