Gee parmalee: Let us proceed: The first sentence in your Bork quoted is grossly in error. Starting with that gross misstatement of my position on this subject, why read on? That being "said" Let us proceed with the sun: From Nasa: "Climate is the state of the weather over long periods of time, tens to thousands of years. Long-term effects of the Sun on the Earth's weather are called climate effects. If the total output of radiant heat and light from the Sun (the solar constant) changed with time, rather than just the X-rays, ultraviolet and other fringe effects of solar activity, the variations would affect the lower atmosphere directly and surely would change the Earth's weather and climate. But we still do not know whether the solar constant has changed in the past or even if it is changing today. The necessary measurements are very hard to make with the required accuracy. Because of absorption and scattering of sunlight in the Earth's atmosphere, these measurements are unreliable if made from the ground. Recently, techniques have been developed to measure the solar constant from space vehicles. There are now several instruments in orbit that are measuring the Sun's output with an accuracy that should be sufficient to detect variations capable of changing the climate. The spacecraft measurements of the solar constant that we are accumulating now will enable us to determine the day-to-day and month-to-month changes in solar output. It should eventually be possible to find out whether the Sun varies, not only during its 11-year sunspot cycle, but perhaps even over longer periods as well." In any problem solving procedure we must address our Known knowns Known unknowns and Unknown unknowns OK Now We have one of our known unknowns. ............... If you are into the math the equations you seek might well be found by looking int the work of Laskar If not: stick with the graphs Please Register or Log in to view the hidden image! For your edification, may I suggest looking for patterns. or look up Laskar's work.