Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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In making such observations an artificial horizon must be used.

But what about the image of the sun upon the artificial horizon?

His artificial horizon had been arranged but a short distance away.

Shortly before noon a halt was called, the artificial horizon set up, and the flags and sledge standards displayed.

I had with me an admirable Hadleys sextant, and an artificial horizon, and I corrected the mean refraction of the suns rays.

He tipped a lever, watched the artificial horizon tilt slightly.

He went below into his room, secured the old 226 log of the M.C. Burns and the artificial horizon.

The instruments used in taking observations for latitude may be either a sextant and an artificial horizon, or a small theodolite.

Murdaugh, always active and efficient, had his artificial horizon ready upon the ice, and gave us an approximate latitude.

Our latitude by artificial horizon was 75 24′ 21″ N., about sixty miles from Cape Hotham.