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Unfortunate Typographical Error in Science News Story
On 03/07/2015 02:32, Quadibloc wrote:
On Tuesday, June 30, 2015 at 4:50:35 AM UTC-6, Martin Brown wrote: It is the Earth's nominal daily rotation period with respect to the sun which is the major source of sunlight. Individual stars aren't going to provoke any kind of response for Kaic or melatonin. Absolutely - the length of the day, not the "sidereal day", is what is important to life. But "rotation" is a _motion_. Something that slows down and speeds up, without any force being applied to the Earth to cause it, is a compound motion, the resultant of the Earth's rotation and the Earth's orbit. We both know that the time of solar transit varies with the seasons because of the Earth's orbital motion. I'd be inclined to cut the journalists some slack here it isn't a major error in the grand scheme of things to say that the Earth rotates in 24 hours wrt the sun. The day is 24 hours long, The *mean* solar day is exactly 24 hours long. The actual solar day varies by upto +/-25s from day to day depending on the Earth's orbit. The cumulative error accounts for the analemma and equation of time. and the Earth rotates in 23 hours, 56 minutes, and 4 seconds. These two facts don't contradict each other at all, which is what Oriel fails to realize. John Savard You are never going to convince him so I don't know why you still try. -- Regards, Martin Brown |
#12
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Unfortunate Typographical Error in Science News Story
In article ,
Martin Brown wrote: On 27/06/2015 18:51, Mike Collins wrote: RichA wrote: On Friday, 26 June 2015 11:57:46 UTC-4, Chris.B wrote: On Friday, 26 June 2015 16:55:02 UTC+2, Quadibloc wrote: ...snip.. Indeed the trick to avoiding jetlag is to manage your exposure to daylight in the new timezone, eat well and go to bed slightly early. Only really a problem on westward intercontinental flights. Falling asleep in the afternoon makes it extremely difficult to sync. I find this to be completely the other way. Going from east to west is reasonably easy once you time in a nap of a sleep cycle or two (90 or 180 minutes for me). Then it is just a longer day. Works wonders going Europe-Mexico with a sleepover in NYC. Going west to east is another matter entirely. Then the day is so shortened we need to step over a day and resync with the new day, so the 8 hours becomes a 16 hour resync from the other end. Takes almost a week to get in sync properly. The other way we are fit for fight the second day in the New World, even if we do wake up a bit early. As for older people I worked on call and shifts until I was over 50 and had less trouble with changing day lengths than some younger people who had less experience of this. Probably because the youngsters were more sleep deprived. If you read Frederic Pohl's autobiography you will find that he experimented with 48 hour days and was quite comfortable with this. Anything longer without sleep and you can spontaneously microsleep without being aware of it - dangerous if driving. A friend working on railway signalling fell foul of this on her way home. Another at the AAT was woken up by shaking and found herself driving parallel to the dirt road. Luckily neither were seriously injured. In a given timezone around 4am and 4pm are the danger times. Taking one 90 minute nap usually makes you good for another 4 hours. I have been going like that for around a week while out sailing. You need to sync it with the body clock though, and that takes some experience to get right. -- mrr |
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Unfortunate Typographical Error in Science News Story
On Mon, 6 Jul 2015 12:35:03 +0200, Morten Reistad
wrote: I find this to be completely the other way. Going from east to west is reasonably easy once you time in a nap of a sleep cycle or two (90 or 180 minutes for me). Then it is just a longer day. Yes, it is well established that most people do better traveling east to west. We can better accommodate a missed sleep cycle in that direction. Traveling west to east either extends the sleepless cycle beyond reasonable limits, or requires an out-of-cycle nap, both of which just prolong jet lag. But everybody is different, and certainly some to better in the other direction. |
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Unfortunate Typographical Error in Science News Story
On Friday, July 3, 2015 at 9:31:02 AM UTC+1, Martin Brown wrote:
The *mean* solar day is exactly 24 hours long. The actual solar day varies by upto +/-25s from day to day depending on the Earth's orbit. The cumulative error accounts for the analemma and equation of time. Empirical thugs and their magnification/identification cronies never had an appreciation of the original heliocentric observations nor its roots in geocentric protocols. The clock driven nightmare that introduced the 'analemma' still prevails although the original precepts remain intact and ready for true modifications and advancements. The term planet comes from the distinction between the motions of the planets through the Zodiac as opposed to the direct motion of the Sun through the same Zodiac. This is not just astronomy, this is history that cannot be disturbed no matter how many louts try to deface astronomy across the centuries. Heed the words of Copernicus well for there is a modification required to his view - "In the first place, they do not swing around the same poles as the first motion, but run obliquely through the zodiac. Secondly, these bodies are not seen moving uniformly in their orbits, since the sun and moon are observed to be sometimes slow, at other times faster in their course. Moreover, we see the other five planets also retrograde at times, and stationary at either end [of the regression]. And whereas the sun always advances along its own direct path, they wander in various ways, straying sometimes to the south and sometimes to the north; that is why they are called "planets" [wanderers]. " Copernicus |
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