OK, the prevailing wisdom says that the tilt of the Earth relative to the plane of the ecliptic is the main reason for the Earth's seasons. This is caused by, among other things, the variation in angle at which the sun's light hits the Earth, the day length and distribution of land/sea masses etc. Now, I'm Ok with this but I don't understand why the distance from the Sun doesn't have a noticeable effect on the seasons. If you look at the figures the Earth is 91,405,436 miles from Sun at perihelion and 94,511,989 miles from Sun at aphelion, so that's a difference of approximately 3,000,000 miles. But, the diameter of the Earth is approximately 8000 miles and therefore no matter how large the Earth's tilt, it is an insignificant change in distance from the Sun in comparison to the 3,000,000 mile change in distance due to the eccentricity of the Earth's orbit. The obvious conclusion is that the effects of the angle at which the Sun's rays hit the Earth and day length etc. are orders of magnitude greater than the effect of distance from the Sun. So if what I've written is correct, all well and good, but I'd like to see some simple figures proving it. Can anyone do the maths or point me to a page that demonstrates (proves) that the distance from the sun is insignificant when compared to other factors in determining the Earth's seasons please?