1) Following the sun 
space or distance westward
• (n.) The distance, reckoned toward the west, between the two meridians passing through the extremities of a course, or portion of a ship`s path; the departure of a course which lies to the west of north.
West'ing noun (Naut. & Surv.) The distance, reckoned toward the west, between the two meridians passing through the extremities of a course, or portion of a ship's path; the departure of a course which lies to the west of north.