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Old September 10th 10, 07:35 AM posted to uk.sci.astronomy
oriel36[_2_]
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Posts: 8,478
Default Jupiter & Ganymede

On Sep 9, 3:48*pm, Martin Nicholson
wrote:
On 9 Sep, 12:18, oriel36 wrote:

This web pages will answer your questions!

http://www.martin-nicholson.info/tro...llkelleher.htm


The thing about this is that the original reasoning which created the
average 24 hour day and calendar cycle of 1461 days out of the raw
daily and orbital cycles is incredibly enjoyable experience to see how
it was all put together,even more intricate than the watches which
eventually were created to mark the steady progression of 24 hour days
which link up with the steady rotation of the Earth where 1 degree of
rotation equates to 4 minutes of time.In this respect,the current
hostility is understandable,historically Royal Society empiricists
always had their own agendas with some sort of bandwagon hierarchy
that has its own internal prejudices of what is acceptable and what is
not,it may be as dumb as not knowing how long it takes the Earth to
turn once or how many rotations are equivalent to an orbital circuit
but it always has the same peevish obstinacy about that way of
thinking.John Harrison wrote extensively about it -

http://books.google.ie/books?id=8roA...ge &q&f=false

So,just for uk.sci.astronomy readers -

The average 24 hour day is founded on the principle,in terms of
planetary dynamics, that the Earth has 365 full rotations to the
central Sun over a period of an orbital circuit and while observations
show that within the annual cycle the rotations to natural noon vary
from one cycle to the next,an averaging process reduces the
observation to a 24 hour average.

The second stage is taking this 24 hour average and determining that
the orbital cycle is 365 days 5 hours 49 minutes based on the yearly
return of a star to a meridian.As the number of daily rotations never
exceed a full 365 rotations in one orbital cycle,the fractional 5 hour
49 minute difference represents the equivalent amount of rotation
needed to correspond with an orbital circumference.

The genius of the calendar system as it ties in with daily and orbital
dynamics in converting raw daily and orbital cycles into a steady and
linear progression of days and years without considering the
fractional discrepancy between the number of rotations per orbital
circuit and the separate orbital geometry and orbital motion itself is
the way the fractional 6 hour difference is set aside in each non-leap
year and squared away when the fractions make up near enough one full
rotation on Feb 29th.The additional daylight/darkness cycle leap day
accounts for the orbital distance traveled thereby completing 4 full
orbital circuits containing 365 1/4 rotations and the calendar
convenience which registers it as 3 years of 365 days and 1 year of
366 days.

The nice thing about this Martin,as it is the usenet,it that within a
few weeks these posts get washed over like an incoming tide washes
away footprints in the sand.It leaves individuals to walk on fresh
ground for a change and enjoy as best they can what others have done
before them and what was done was truly amazing for the good of heart
and those with a lively imagination tempered by interpretation.