A double-reflecting instrument for measuring angles, primarily altitudes of celestial bodies
a measuring instrument for measuring the angular distance between celestial objects; resembles an octant a unit of angular distance equal to 60 degrees
A navigational device for deriving angular distances between objects so as to determine latitude and longitude
A navigational instrument used to determine the vertical position of an object such as the sun, moon or stars Used with celestial navigation
It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle
An astronomical instrument for measuring angles, primarily altitudes of celestial bodies, to determine latitude
> The backstaff was an early navigational instrument used to gauge latitude at sea It was replaced by a more accurate device called the octant The octant was replaced by an even more accurate instrument, the sextant, which is still being used today Note: Latitude is the distance north or south of the equator, which is measured on a map or globe in degrees along a meridian
An instrument, combining telescope and graduated quadrant, used for measuring angular distances, esp the altitude of sun, moon and stars Used at sea to determine latitude and longitude
a measuring instrument for measuring the angular distance between celestial objects; resembles an octant