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With due respect I still do not see the "direction of sun's gravity or the
angle of gravity".
http://calgary.rasc.ca/images/earth_rotation_anim.gif
(force) gravity = (G) m1 m2 / d2 (no angle in the formula, direction is
constant, magnitude may vary due to d variation eliptical orbit)
system in dinamical equilibrium (speed) = gravitation against centrifugal
= movement (translation)
all explanations given, shows how good are you for not answering my
assertion and going arround it.
They go:
As a system
a.- sun is so massive but is so far away, that it pulls the same everywhere
on earth (no gravity sun's angle), when in sinc with the moon total pull
can be measured in shape change of bodies of water (tides), while earth
pull (small distance high mass compared to "us") is dominant: "The sun and
moon's impact is only one 5-millionth of the force of Earth's
own gravitational impact at Earth's surface."
b.- total gravity "acceleration" felt by an object on earth fullfill the
gravity law through angular momentum (no gravity sun's angle)
translation (orbit)
c.- there is a tiny gavity difference due to eliptical (rather than
circular) orbit of earth with respect to the sun (d2 efect over plane of
rotation) (no gravity sun's angle).
d.- Aphelio (4 July) and Perhelio (4 Dec) do not coincide with either
solstice (21-22 Dec / 21-22 June).
rotation
c.- the inclution of rotation allows 24 hours days (rather than 6 month
ones) (no gravity sun's angle). 24 hour is a convention. Longer period (for
one rotation) if looking "toward the sun" (solar time), sorter period if
looking "to infinity" (sidereal time)
d.- the inclution of tilt in rotation axis (with respect to sun axis)
allows (earth) seasons (no gravity sun's angle).
e.- wobble also changes the "measure time."
http://articles.timesofindia.indiatimes.com/2011-03-13/india/28685416_1_160-km-wide-andaman-islands-nicobar
Compounding earth plus sun total gravity over an objet on earth surface
does not "creates" a gavity sun's angle. Gravity will always be a force
"towards/backward" the other mass or masses pulling "from/to" the center of
mass of each object. We could conceptualice it as having 90°, if that point
would have surface ...The direction will be determined by the difference
between M1 and M2 (or its solution if more than one mass and variable
distances are included), therefore including the moon neither creates a
gravity sun's angle.
Or my mathematical geography is that bad?
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