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The sun was never on our schedule anyway

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Source: The Boston Globe
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The op-ed by Susan Kohl Malone (“Permanent daylight saving time is not the fix we think it is,” Opinion, Oct. 19) argues against making daylight saving time permanent by underscoring its impact on circadian rhythms. At least three arguments complicate the notion that clock time needs to align with daylight time. First, the position of the sun in the sky varies by an hour or more between the easternmost and westernmost points of each time zone in the United States. For example, on Oct. 19, the sun sets in Lexington, Ky., at 6:54 p.m. and in Boston at 5:56 p.m. It’s not entirely clear that the additional hour of daylight in Kentucky has any demonstrable effects on the health of Lexington residents as compared to their counterparts in Boston. Second, as Malone points out, clock time does not change the actual amount of daylight in a day. Yet in much of the United States, day length varies so much over the year that our sleep-wake cycles cannot be aligned with it. In Boston, the longest day is 15 hours and 17 minutes and the shortest is 9 hours and 4 minutes, a difference of 6 hours and 13 minutes. Which of these is our circadian rhythm aligned with?

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