Re: The Equinox 2009

oriel36 wrote:


Hah !,anyone can make the prediction that it will be colder in New
York in January than in July,however,ask the same people to explain
why that happens and the nearest this forum comes,and it is supposed
to be the most knowledgeable on planetary dynamics,is inclination to
solar radiation which derived by referencing the Sun to 'tilt'.The
major reason for temperature fluctuations between January and July at
different latitudes is due the length of time a given location spends
in the solar radiation or in the orbital shadow and that relies on an
understanding of daily rotational and orbital dynamics.With barely
less than 3 months to go before Copenhagen,I can certainly affirm that
nobody,at least presently, has a clear understanding of the reasons
why in 3 months it will be colder in Copernhagen than today.



With an earth orbital eccentricity of 0 and the polar axis 90°, with
respect to the plane of the ecliptic, the earth would have no annual
seasons whatsoever. There might be a measurable effect of roughly
eleven years due to the solar cycle.

http://edu-observatory.org/mcc/homework/homework.ch.1-3/H.A.Rey.orbit.gif

The earth's orbital eccentricity is currently 0.0167 (slight ellipse).
But the major cause of annual seasons, as the earth falls around the
sun, is due to the axial tilt of 23°+ causing extra warming in one
hemisphere followed by extra warming the the other hemisphere six
months later.

Even little school children can understand this basic concept, Gerald,
of which you appear to have so much trouble.

http://edu-observatory.org/mcc/homework/homework.ch.1-3/H.A.Rey.orbit.gif




.

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