Sentence:  I love these sons of earth every mother's son of them, with their great hearty hearts rushing tumultuously in herds from spectacle to spectacle, as if fearful lest there should not be time between <WSD>sun</WSD> and <WSD>sun</WSD> to see them all, and the sun does not wait more than in haying-time. 
Meaning of the word marked with <WSD> tags:  Sunrise or sunset.