Apollo’s Arrow is also the title of a non-fiction book.
The title of the book is a reference to a mythical arrow that once belonged to the god Apollo. According to legend, the arrow was gifted by a priest to Pythagoras, allowing him to dart through space and time.
“he will count 1969,697 measures towards the zenith.” is a distance (Space)
“In a 46,241,860th fraction of sidereal day,” is a duration (Time)
Pythagoras is used to calculate the length of the 3rd side of a right triangle, when given the length of the other 2 sides.