In 1679 the English astronomer Edmond Halley visited Hevelius and compared the use of a sextant having telescopic sights with Hevelius' sextant with open sights.
The Rotterdam screening policy evolved during the study, but predominantly consisted of a sextant prostate biopsy for men with a PSA >3 ng ml−1.
While limiting the scoring to anterior teeth (e.g. central incisors) may eliminate a considerable number of individuals with posterior located erosion, it is considered that the use of a sextants technique, which involves a full mouth examination but scoring the most severely worn surface on each sextant, would favour easy application and reproducibility.
Celestial navigation -- the art of using a sextant and the heavenly bodies to determine one's position -- is, in fact, a central element of nautical tradition.
After a week of travel a sextant observation indicated that they were averaging nine nautical miles a day, (17 km; 10 mi), putting them ahead of schedule.
Similarly, a sector that has a central angle of 60 degrees is a sextant, and a sector with a central angle of 45 degrees is an octant.
Most larger vessels carry a variety of compasses (both magnetic and gyros) as well as radars, satellite navigation equipment, omega positioning gear, a sextant, direction finding equipment, echo sounders, fish finders and sonars.
"We didn't used to live like this, brother against brother," lamented Josh Foler, a sextant of the synagogue, as he mediated, clearly agonized over the dispute.
You can also find local noon by repeatedly sighting with a sextant; when the angle of elevation is greatest, it is local noon.
In 1940, a colonial administrator and his work party found a liqueur bottle and some corks, a human skull and some bones, the partial sole of a woman's shoe, parts of a man's shoe, and a sextant box.
