(i) Sun

(ii) Two hebrew words used..

(1) Shemesh (8121) - from an unused root meaning to be brilliant; the sun; by implication, the east; figuratively, a ray, i.e. (arch.) a notched battlement:

(2) Chammah (2535) - heat; by implication, the sun: from a primitive root; to be hot (literally or figuratively):

(iii) (1) The hard dealings of everyday work.

(2) On fire for the Lord (Shining forth His nature).

(iv) (1) (a) 1:6

(b) Matt 5:45

(2) (a) 6:10

(b) Ps 84:11; Matt 13:43; 17:2