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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Leap seconds
From: Frank Reed
Date: 2009 Jan 11, 18:58 -0800
From: Frank Reed
Date: 2009 Jan 11, 18:58 -0800
Gary L, last week you wrote: "I remember back during the fuel crisis of the '70s when the idea of going on DST all year round was proposed the ordinary people protested "we don't want our kids going to school in the dark" and the farmers complained " the cows don't like being milked in the dark." " Yep. These things come up on a regular basis. DST/"Summer Time" always sparks controversy --and well it should! Briefly during the first world war and again during the second war, the US was on year-round DST. It was more controversial in the 70s because people seemed to have a better understanding that the supposed savings in energy costs were smaller than claimed, and, as you noted above, the impracticalities were worse. I remember going to school in the dark. It made me sleepy and the teacher, too, and I am quite certain that I didn't learn as well. I don't remember, but I wonder if anyone pointed out that the US was putting itself on the same standard as Stalin's "decree time" by going on year-round DST. I bet that would have made scored some points back then! What's less well known is that local regions have been steadily moving their time zones east for a century. If you look at the boundary between Eastern and Central Time, it was originally in western Pennsylvania up north, and in the south all of Georgia and Florida were on Central Time (though some towns in eastern Georgia kept Eastern Time locally). Then in 1918-1919 when the federal government first set official standards (the time zones in the US were informal, but almost universally used, from 1883-1918), the boundary ran through central Ohio and also central Georgia. Later, I believe in 1942, most of the rest of Georgia moved to Eastern Time. Ohio and Michigan, even most of the U.P. which is far to the west, are now on Eastern Time. And as you know just recently, Indiana formally moved itself to Eastern Time. These areas are all west of the 82.5 longitude line which should, from a purist standpoint, be the dividing line between the time zones. So they are well ahead of the Sun. You added: "The ordinary people didn't understand that they could just change the number of the hour of school time and milking time and keep the same schedule in relation to sun time." In practice, this is harder than it sounds. The big benefit of standard time is synchronization. And it's hard to escape that. And you concluded: "So I don't think they will do well unless we keep our ordinary time close to sun time." It's all a matter of education. Dropping leap seconds would have the same effect as moving the time zones a tiny bit further to the west (the boundaries wouldn't change --it's the same effect without moving the boundaries). This would occur at a rate of about 1 second every two years increasing to one second per year by 2100. So a century from now the difference would be around a minute and a half. This would be completely un-noticeable except for folks like us. At some point, in three or four centuries, the difference would add up to an amount that might be inconvenient. At that point, Indiana and western Georgia might want to vote themselves back to Central Time. -FER --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---