Original - Diagram of a marine sextant, an instrument used at sea for measuring the altitude of a heavenly body above the horizon. The value of that angle, together with the knowledge of the time at the exact moment of the observation can be used to calculate a line of position.
Reason
A detailed and precise diagram adding significant value to the article about the sextant. The drawing is geometrically consistent and accurate, in the sense that a real instrument could be based on it. A simplified "working" version was used in this FP animation.
Articles this image appears in
Sextant
Creator
Joaquim Alves Gaspar

Not promoted --jjron (talk) 12:15, 29 February 2008 (UTC)[reply]
Quorum not met.