To skim the horizon means to move close to, and parallel to the horizon. The sun only does that at the north and south poles. Elswhere, the sun rises from the horizon at dawn, and sinks below it at sunset. (It takes on a hue often called "coppery" at these times).
McTag wrote:As the sun goes down, it could be said to "skim the horizon".
I do not agree, for the reasons stated above.
Dr Huff wrote:a coppery color---one predominantly brown
The adjective "coppery" covers a wide range of hues from red to brown. The phrase "The coppery sun" is so commonplace as to be in danger or acquiring cliché status, as a little research will quickly reveal.
A little research will also reveal that tanguatlay has asked this question on at least one other forum.