You'd get more accurate clock/Sun coordination moving the top left state in each TZ into the TZ to the left of where it is (dark blue ones would go medium blue), and the bottom right one to the right (light pink/purple ones go dark pink). Most TZs would go from three or even four different colour bands to two.
IFF, that is, the colour bands represent what I think they do, "rough time of day according to the Sun"?
IFF, that is, the colour bands represent what I think they do, "rough time of day according to the Sun"?