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#11
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Chronobiologists
On Tuesday, October 10, 2017 at 5:26:56 PM UTC+1, Chris L Peterson wrote:
In any case, it is known that when humans are isolated from the day/night cycle, their internal clocks float somewhat off a 24-hour cycle. It's a different amount for different people, and there's at least ten minutes of uncertainty in any identified mean values- a value larger than the mere four minutes that separate a solar and sidereal day. There is always human driftwood for such wood has the property of wood but no life in it. The polar day is firmly established at the South pole where people there will see the Sun continuously when weather permits until next March when polar sunset occurs as a singular event.People are not made of stone and can both see and feel how the milestones of a weekday and one rotation can be separately appreciated in terms of the polar day/night cycle and its rotation in isolation or the seasons where these two great cycles combine. |
#12
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Chronobiologists
Chris L Peterson:
It seems obvious that circadian rhythms are regulated by light/dark cycles. It's not like we have some sort of Focault pendulum organ in our heads to detect the actual rotation period of the Earth. True, but apparently we do have a genetic pendulum, created by billions of years of regular light-and-dark cycles https://www.nobelprize.org/nobel_pri...s/2017/press.h tml. Or by God 6000 years ago, your call. It is interesting to note that the rotation of a Foucault pendulum is tied to sidereal time, not Timex time. From the Wikipedia article "At either the North Pole or South Pole, the plane of oscillation of a pendulum remains fixed relative to the distant masses of the universe while Earth rotates underneath it, taking one sidereal day to complete a rotation." And "A 'pendulum day' is the time needed for the plane of a freely suspended Foucault pendulum to complete an apparent rotation about the local vertical. This is one sidereal day divided by the sine of the latitude." Wonder what our resident nut jobs think about that? -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |
#13
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Chronobiologists
People who journey through life generally fall in love with their surroundings with the passing of each cycle, the colors spring out of the ditches and gardens as flowers come into bloom, the trees which have no mind or memory show their leaves in a joyous response to an Earth that creates two distinct day/night cycles as it turns in two ways to the heat of our parent star..
For a humanity who wishes to venture into space a study is required of our body clocks and how to adapt to both the daily and annual wake and sleep cycles or the activity and dormancy cycle which was more prevalent among our ancestors, even within living memory. https://www.usap.gov/videoclipsandmaps/spwebcam.cfm The inhuman attempt to create a division between the Sun (day) and the stars (night) by rotation is consigned to a bad period of human history as it is replaced by not just one type of rotation but two. |
#14
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Chronobiologists
On Tue, 10 Oct 2017 15:59:37 -0400, Davoud wrote:
Chris L Peterson: It seems obvious that circadian rhythms are regulated by light/dark cycles. It's not like we have some sort of Focault pendulum organ in our heads to detect the actual rotation period of the Earth. True, but apparently we do have a genetic pendulum, created by billions of years of regular light-and-dark cycles https://www.nobelprize.org/nobel_pri...s/2017/press.h tml. Or by God 6000 years ago, your call. Oh yeah. Didn't mean to suggest otherwise. Just that it isn't rigidly tied to 24 hours. It has evolved to about that, but is locked by external stimuli to actual conditions. |
#15
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Chronobiologists
This new and productive area of research which combines humans to the two surface rotations by way of two internal body clocks is not going to be dragged back by celestial sphere enthusiasts nor by the recent upstarts who conjured up the idea that the Earth turned once in 24 hours but only back in 1820. Any person who occupies themselves with such notions automatically excludes themselves from either the astronomical aspect or the human one.
Insights are absorbed nowadays so that innovations like the partitioning of the inner and outer planets by perspective seen from a moving Earth was rapidly adopted where relative speeds govern the perspective for an outer planet (now a relative term) while inner planets simply are seen to run their circuits with little input from the slower moving Earth. The explanation of the polar day/night cycle exclusive to the weekday rotation naturally correlates with the body clock of dormancy and activity but the annual cycle is far more subtle than the 24 hour cycle. Of course only those who live in those latitudinal bands where the annual cycle is more pronounced will have a sense of the impact but many older people put it in perspective by telling me they prefer Easter to Christmas when the first signs of a rejuvenated nature start to appear, for me it is the first shoots of daffodils around mid-February coinciding with the 6 Nations rugby tournament. |
#16
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Chronobiologists
On Tuesday, October 10, 2017 at 11:00:23 PM UTC-6, Gerald Kelleher wrote:
nor by the recent upstarts who conjured up the idea that the Earth turned once in 24 hours but only back in 1820. You are just reading too much into an oversimplification. The Earth turns once in 23 hours, 59 minutes, and 4 seconds... leading to an average day-night cycle, when the Earth's rotation is combined with its revolution around the Sun, that averages to 24 hours. But that *average* was only _exactly_ 24 hours back in 1820, and now it's a tiny fraction of a second longer. If you use the metric atomic time definition of the second. Which you need to, if you are wanting to consistently define the ohm, the henry, the farad, and so on and so forth, so that the resonant frequency of *this* inductance and *that* capacitance remains the same number of cycles per second, even as the Earth slows down. Leap seconds aren't due to anyone being "pretentious"; accurate measurement of physical quantities is needed for making machines that work. John Savard |
#17
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Chronobiologists
The internal body clocks tuned to both the daily and annual cycle rely on distinct phases which can be recognized in familiar terms as sunrise/noon/sunset/midnight even if these terms refer to the two distinct rotations responsible for the 24 hour weekday and the polar day/night cycle.
People at the latitudes of North Western Europe rather than Southern Europe feel the impact of the night phase of the polar night cycle which is just beginning to set in as twilight still exists at the North pole. The descent into polar night occurs as a widening expansive of surface area with the North pole at the center where the Sun remains out of sight and Arctic sea ice develops on this principle. https://epic.gsfc.nasa.gov/ The Americans determine winter begins on December 21st however midwinter was always on the Solstice for the same reasons the body clock registers daily noon or midnight as neither the warmest nor coldest part of the day. https://aholdencirm.files.wordpress....ck-660x422.png The celestial sphere enthusiasts imagine more rotations than 24 hour weekdays but as this new area of research begins to develop with two internal clocks to consider, there is no time to waste on people who can't handle neither the weekday cycle nor the polar day/night cycle. Eventually the RA/Dec modelers will become a special group within human history but as an irrelevance. The joy in actually helping people with the winter blues or researching the health obstacles for space travel among other things. Let the celestial sphere enthusiasts discuss metal and glass whether it is telescopes or cars as exciting research is beyond them. |
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