Till over the mast at noon -"

from Samuel Taylor Coleridge – Rime Of The Ancient Mariner on Rap Genius

Meaning

Perhaps suggesting their destination was a straight shot from home?

As the ship moves south towards the equator, the highest point the sun reaches in it’s apparent movement is directly above the mast (a pole to carry sails of a ship) or the zenith which would always happen in the equatorial belt (hence conforming the southward movement).

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