[DOC] [TLE] Celestial navigation - Wikipedia [PAR] An observer located anywhere on the circumference of this circle on the earth, 
measuring the angle of the same celestial body above the horizon at that instant
... [DOC] [TLE] Sextant - Wikipedia [PAR] A sextant is a doubly reflecting navigation instrument used to measure the angle 
between any ... A sextant can also be used to measure the lunar distance 
between the moon and another ... The advantage of this type is that both the 
horizon and celestial object are bright and as .... Fine adjustments are then made 
as above. [DOC] [TLE] Measuring the Night Sky - Fort Worth Astronomical Society [PAR] Apr 3, 2014 ... Astronomers measure angular separation of objects in degrees. ... Halfway from 
the zenith to the horizon is 45 degrees. ... But your hands and fingers are a 
remarkably accurate (and convenient) measuring tool. ... The angle between the 
visible horizon and the the north celestial pole, marked almost exactly... [DOC] [TLE] Measuring The Sky  One Minute Astronomer [PAR] Apr 19, 2009 ... ... and arc seconds when talking about the separation of celestial objects. ... 
Astronomers measure angular separation of objects in degrees. ... And the 
angular separation of any point on the horizon and the point ... But your hands 
and fingers are a remarkably accurate (and convenient) measuring tool. [DOC] [TLE] The History of the Sextant [PAR] ... instrument, a sextant, to measure the angle of the celestial body above a ... At 
the equator, which is zero degrees latitude, Polaris is on the horizon with zero .... 
moon and the celestial body would be precisely at that angular distance and then
... [DOC] [TLE] ION Museum: Sextant with beveled scale [PAR] Item History: The sextant, an instrument for measuring angles, was ... to find 
longitude by measuring the angular distance between the moon and a nearby 
star. ... and the angle of the celestial body above the horizon is read from the 
scale. [DOC] [TLE] CHAPTER 16 INSTRUMENTS FOR CELESTIAL NAVIGATION [PAR] principal use is to measure the altitudes of celestial bodies above the visible sea 
horizon. It may also ... measuring the angular distance between two terrestrial. [DOC] [TLE] Measuring distances by parallax method - EAAE [PAR] So we need two instruments for measuring (an angle-measure tool and a ... 
Here's how we might measure the distance of a tree, like in the situation that is 
sketched above. ... it is not useful when the object is very far away as celestial 
objects are. ... the horizon) that is directly behind (or in line) with their position 
and the tree. [DOC] [TLE] Navigation - Sextant [PAR] Hold the instrument vertically and point it toward the celestial body. ... Early in the 
18th century, the astronomers had developed a method for predicting the angular 
distance between the moon and the ... An octant measures angles up to 90 
degrees and is ideally suited for observations of celestial bodies above the 
horizon. [DOC] [TLE] Navigational Instruments @ Celestial Navigation [PAR] The main instruments mariners need for Celestial Navigation are the 
chronometer and some way of measuring the altitude of bodies above the 
horizon. ... called the kamal, a rectangle of wood cut to fit the distance from the 
horizon to the star. ... The cross-staff measures up from the horizon to the body 
rather than down from... [DOC] [TLE] Mason Dixon Line | Astro Navigation Demystified [PAR] The zenith sector is a far more accurate instrument for measuring angles than the 
... allow for the height of the observer's eye above the horizon, this is known as 
Dip. ... were to measure the angular distance from his zenith to the celestial body,
... [DOC] [TLE] Navigation and Related Instruments in 16th-Century England - Fort ... [PAR] Although the relationship of certain heavenly bodies to time of day and terrestrial 
... But above all else, dead reckoning depends on reliable instruments. ... of 
longitude, the costly and delicate celestial globe gradually fell out of use. ... was 
used to determine latitude by measuring the angle between the horizon and 
Polaris,... [DOC] [TLE] Museo Galileo - Multimedia - Octant and sextant [PAR] These instruments were the

Question: This instrument measures the angular distance of a celestial body above the horizon
Answer: sextant