Clive K
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The earth is of the order of 8000 miles diameter - the difference in distance to the sun is up to a couple of million miles between (nearest) aphelion (July) & (farthest) perihelion (Jan)
They're not of the same order of magnitude.
And the last bit is the only part of light's journey that has anything to diffuse it. The atmosphere and it travels further through the atmosphere at this time of year than in the summer months.





