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  2. Position angle - Wikipedia

    en.wikipedia.org/wiki/Position_angle

    In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky. The International Astronomical Union defines it as the angle measured relative to the north celestial pole (NCP), turning positive into the direction of the right ascension. In the standard (non-flipped) images, this is a counter clockwise ...

  3. Goniometer - Wikipedia

    en.wikipedia.org/wiki/Goniometer

    A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία (gōnía) ' angle ' and μέτρον (métron) ' measure '. [1] The protractor is a commonly used type in the fields of mechanics, engineering, and geometry.

  4. Theodolite - Wikipedia

    en.wikipedia.org/wiki/Theodolite

    Theodolite. A direct-readout theodolite, manufactured in the Soviet Union in 1958 and used for topographic surveying. A theodolite (/ θiˈɒdəˌlaɪt /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying, but it is ...

  5. Gradian - Wikipedia

    en.wikipedia.org/wiki/Gradian

    54′. In trigonometry, the gradian – also known as the gon (from Ancient Greek γωνία (gōnía) 'angle'), grad, or grade[1] – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees. [2][3][4] It is equivalent to ⁠ 1 400 ⁠ of a turn, [5] ⁠ 9 10 ⁠ of ...

  6. Combination square - Wikipedia

    en.wikipedia.org/wiki/Combination_square

    The protractor head can be used for: Measuring and checking angles between surfaces, edges, and markings. Marking angles from an edge; Directly transferring angles, like a bevel gauge (sliding T gauge), to minimise measurement errors and inaccuracies. Measuring and marking angles relative to the horizontal by using the spirit level. [2]

  7. Sextant - Wikipedia

    en.wikipedia.org/wiki/Sextant

    Sextant. A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. The estimation of this angle, the altitude, is known as sighting or shooting ...