The difference between the two readings will be the distance run.
"Lectures in Navigation"
Ernest Gallaudet Draper
These sextant readings of the sun's altitude were continued for the next twenty-four hours.
"My Attainment of the Pole"
Frederick A. Cook
At last we got the coin, and were faint with heat and hunger by the time we got home to lunch,-this to show the climate of Bangalore; but perhaps my readings of the temperature make it out to be hotter than it is.
"From Edinburgh to India & Burmah"
William G. Burn Murdoch