Those numbers correspond with the 4 corners of the earth, you see. Each rotation of earth has 4 mid-days, 4 mid-nights, 4 sun-ups and 4 sun-downs. Ignorance of 4 day harmonic cubic nature indicts humans as unfit to live on earth!
Familiarity with the Time Cube really would of helped the author of this paper so he would not have to re-invent the 4 day harmonic cubic truth, sparing him from the ignorant one day linear folly that blinds humanity to the 4 simultaneous corners of Earth's divine rotation!