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searching for Backstaff 4 found (23 total)

alternate case: backstaff

Elton's quadrant (979 words) [view diff] exact match in snippet view article find links to article

at the top spans 60° as did the arc on the backstaff. The main graduated arc subtends 30° as in the backstaff. The 30° arc is graduated in degrees and sixths

Sextant (3,163 words) [view diff] exact match in snippet view article find links to article

Also, unlike the backstaff, the sextant allows direct observations of stars. This permits the use of the sextant at night when a backstaff is difficult to

Quadrant (instrument) (2,881 words) [view diff] exact match in snippet view article

back observation quadrant. This instrument was used in the manner of a backstaff to measure the elevation of the sun by observing the position of a shadow

Keith Muckelroy (800 words) [view diff] exact match in snippet view article find links to article

ISBN 0070439516 Muckelroy, Keith, 1977: A Possible Seventeenth-Century Dutch Backstaff. The Mariner's Mirror Vol. 63, London, pp 213-214, ill. A find from the