Physics

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Why does the sun & moon appear larger at the horizon than when they are at their highest points in the sky? Can refraction really account for all that difference? Has anyone proved it? Is the ratio of the biggest to smallest moon sizes the same as the ratio for that of the sun? How can we account for those observed ratios? Why are their colours more yellowy-orange, nearer the horizon? At a certain time of the year, the moon remarkably appears fairly high in the sky, but then sets below the horizon fairly rapidly why does it appear to move more slowly all the other nights of the year?