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  2. Longitude by chronometer - Wikipedia

    en.wikipedia.org/wiki/Longitude_by_chronometer

    The Sextant reading is known as the 'Sextant Altitude'. This is corrected by use of tables to a 'True Altitude'. The actual declination and hour angle of the celestial body are found from astronomical tables for the time of the measurement and together with the 'True Altitude' are put into a formula with the assumed latitude.

  3. Celestial navigation - Wikipedia

    en.wikipedia.org/wiki/Celestial_navigation

    A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...

  4. Wikipedia : Featured picture candidates/Using the sextant

    en.wikipedia.org/wiki/Wikipedia:Featured_picture...

    Voilà, the new version of the sextant is ready. The animation is now smoother and a bit simplified. I decided to include the light rays only at the begining and at the end, otherwise the image would be too cluttered. But the sextant is a working replica, i.e., the angles and reflections are all correct. - Alvesgaspar 21:34, 1 November 2006 (UTC)

  5. 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 ...

  6. Sextant (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Sextant_(astronomy)

    Sextant (astronomy) In astronomy, sextants are devices depicting a sixth of a circle, used primarily for measuring the position of stars. There are two types of astronomical sextants, mural instruments and frame-based instruments. They are of significant historical importance, but have been replaced over time by transit telescopes, other ...

  7. Scientists discover ‘dark’ oxygen being produced more than ...

    www.aol.com/scientists-discover-dark-oxygen...

    A mysterious phenomenon first observed in 2013 aboard a vessel in a remote part of the Pacific Ocean appeared so preposterous, it convinced ocean scientist Andrew Sweetman that his monitoring ...

  8. Astrolabe - Wikipedia

    en.wikipedia.org/wiki/Astrolabe

    A modern astrolabe made in Tabriz, Iran in 2013. An astrolabe ( Greek: ἀστρολάβος astrolábos, 'star-taker'; Arabic: ٱلأَسْطُرلاب al-Asṭurlāb; Persian: ستاره‌یاب Setāreyāb) is an astronomical instrument dating to ancient times. It serves as a star chart and physical model of visible heavenly bodies.

  9. Mike Gundy tried to make a point in his latest foot-in-mouth ...

    www.aol.com/sports/mike-gundy-tried-point-latest...

    Yet his answer was casual, flippant and self-centered rather than conveying the serious nature of the charge. In doing so, he turned what was a lightly covered national story — Gordon’s arrest ...