BT BB 84a(17) :והאי דקא חורא בפלגא דיומא‏ : the fact that (the sun) is lighter in color at midday
See the entire entry for ḥwr vb. to be white

BT BB 84a(17) :דסמקא בצפרא ובפניא‏ : (the sun) that is red in the morning and in the evening
See the entire entry for smq vb. to be red