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That temperature is determined by when energy release in the Sun's core is balanced by energy departing from it.
That requires a lot of complicated physics to work out.
The two winters and summers now coincide in the Southern Hemisphere. Since the Earth's orbit as well as its spin precesses, that causes the Earth's obliquity to vary between 22.1 and 24.5 degrees. It controls the intensities of the obliquity summers and winters, the greater obliquity being the more intense.
Big ice-age glaciers need continent to form on, and at this time, it is the northern hemisphere that has the most midlatitude continent.
It is based on tree-ring counting and correlating the rings from different trees.
The eccentricity vector is eccentricity * (perihelion direction).
One gets good agreement with radiometric-dating ages of meteorites: The age of the Sun and the relativistic corrections in the EOSWe show that the inclusion of special relativistic corrections in the revised OPAL and MHD equations of state has a significant impact on the helioseismic determination of the solar age.
Models with relativistic corrections included lead to a reduction of about 0.05-0.08 ; Gyr with respect to those obtained with the old OPAL or MHD EOS.
Our best-fit value is t = (4.57 /- 0.11) ; Gyr which is in remarkably good agreement with the meteoritic value for the solar age.
We argue that the inclusion of relativistic corrections is important for probing the evolutionary state of a star by means of the small frequency separations delta nu/(G*M)for solar mass M, atom mass m, and core temperature T.