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- Celestial_navigation abstract "Celestial navigation, also known as astronavigation, is the ancient art and science of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position. Celestial navigation uses \"sights,\" or angular measurements taken between a celestial body (the sun, the moon, a planet or a star) and the visible horizon. The sun is most commonly used, but navigators can also use the moon, a planet or one of 57 navigational stars whose coordinates are tabulated in the Nautical Almanac and Air Almanacs.Celestial navigation is the use of angular measurements (sights) between celestial bodies and the visible horizon to locate one's position on the globe, on land as well as at sea. At a given time, any celestial body is located directly over one point on the Earth's surface. The latitude and longitude of that point is known as the celestial body’s geographic position (GP), the location of which can be determined from tables in the Nautical or Air Almanac for that year.The measured angle between the celestial body and the visible horizon is directly related to the distance between the celestial body's GP and the observer's position. After some computations, referred to as sight reduction, this measurement is used to plot a line of position (LOP) on a navigational chart or plotting work sheet, the observer's position being somewhere on that line. (The LOP is actually a short segment of a very large circle on the earth which surrounds the GP of the observed celestial body. 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 of time, would observe that body to be at the same angle above the horizon.) Sights on two celestial bodies give two such lines on the chart, intersecting at the observer's position (actually, the two circles would result in two points of intersection arising from sights on two stars described above, but one can be discarded since it will be far from the estimated position—see the figure at \"example\" below). Most navigators will use sights of three to five stars, if they're available, since that will result in only one common intersection and minimize the chance for error. That premise is the basis for the most commonly used method of celestial navigation, and is referred to as the \"Altitude-Intercept Method.\"There are several other methods of celestial navigation which will also provide position finding using sextant observations, such as the \"Noon Sight\", and the more archaic Lunar Distance method. Joshua Slocum used the Lunar Distance method during the first ever recorded single-handed circumnavigation of the world. Unlike the Altitude-Intercept Method, the noon sight and lunar distance methods do not require accurate knowledge of time. The altitude-intercept method of celestial navigation requires that the observer know exact Greenwich Mean Time (GMT) at the moment of his observation of the celestial body, to the second—since every four seconds that the time source (commonly a chronometer or in aircraft, an accurate \"hack watch\") is in error, the position will be off by approximately one nautical mile.".
- Celestial_navigation thumbnail Marine_sextant.svg?width=300.
- Celestial_navigation wikiPageExternalLink navigationalalgorithms.
- Celestial_navigation wikiPageExternalLink the-nautical-almanac.
- Celestial_navigation wikiPageExternalLink F1.html.
- Celestial_navigation wikiPageExternalLink index.html.
- Celestial_navigation wikiPageExternalLink www.celestialnavigation.net.
- Celestial_navigation wikiPageExternalLink easylun.html.
- Celestial_navigation wikiPageExternalLink www.navigation-spreadsheets.com.
- Celestial_navigation wikiPageID "143335".
- Celestial_navigation wikiPageLength "27403".
- Celestial_navigation wikiPageOutDegree "107".
- Celestial_navigation wikiPageRevisionID "706296345".
- Celestial_navigation wikiPageWikiLink Air_navigation.
- Celestial_navigation wikiPageWikiLink Airplane.
- Celestial_navigation wikiPageWikiLink Apollo_(spacecraft).
- Celestial_navigation wikiPageWikiLink Astrodome_(aeronautics).
- Celestial_navigation wikiPageWikiLink Astronautics.
- Celestial_navigation wikiPageWikiLink Atomic_clock.
- Celestial_navigation wikiPageWikiLink Attitude_control.
- Celestial_navigation wikiPageWikiLink Azimuth.
- Celestial_navigation wikiPageWikiLink Boeing_747.
- Celestial_navigation wikiPageWikiLink Bomber.
- Celestial_navigation wikiPageWikiLink Bowditchs_American_Practical_Navigator.
- Celestial_navigation wikiPageWikiLink Category:Celestial_navigation.
- Celestial_navigation wikiPageWikiLink Category:Navigation.
- Celestial_navigation wikiPageWikiLink Celestial_pole.
- Celestial_navigation wikiPageWikiLink Circle_of_equal_altitude.
- Celestial_navigation wikiPageWikiLink Cockpit.
- Celestial_navigation wikiPageWikiLink Collimated_light.
- Celestial_navigation wikiPageWikiLink Constellation.
- Celestial_navigation wikiPageWikiLink Dead_reckoning.
- Celestial_navigation wikiPageWikiLink Degree_(angle).
- Celestial_navigation wikiPageWikiLink Earth.
- Celestial_navigation wikiPageWikiLink Ecliptic.
- Celestial_navigation wikiPageWikiLink Ephemeris.
- Celestial_navigation wikiPageWikiLink Ex-meridian.
- Celestial_navigation wikiPageWikiLink File:Using_sextant_swing.gif.
- Celestial_navigation wikiPageWikiLink Flight_simulator.
- Celestial_navigation wikiPageWikiLink Gimbal.
- Celestial_navigation wikiPageWikiLink Global_Positioning_System.
- Celestial_navigation wikiPageWikiLink Greenwich_Mean_Time.
- Celestial_navigation wikiPageWikiLink Hacker_(computer_security).
- Celestial_navigation wikiPageWikiLink Harvard_University.
- Celestial_navigation wikiPageWikiLink History_of_longitude.
- Celestial_navigation wikiPageWikiLink Inertial_navigation_system.
- Celestial_navigation wikiPageWikiLink Intercept_method.
- Celestial_navigation wikiPageWikiLink Intercontinental_ballistic_missile.
- Celestial_navigation wikiPageWikiLink John_Harrison.
- Celestial_navigation wikiPageWikiLink Joshua_Slocum.
- Celestial_navigation wikiPageWikiLink Kamal_(navigation).
- Celestial_navigation wikiPageWikiLink Latitude.
- Celestial_navigation wikiPageWikiLink Link_Trainer.
- Celestial_navigation wikiPageWikiLink List_of_proper_names_of_stars.
- Celestial_navigation wikiPageWikiLink List_of_selected_stars_for_navigation.
- Celestial_navigation wikiPageWikiLink Lockheed_SR-71_Blackbird.
- Celestial_navigation wikiPageWikiLink Longitude.
- Celestial_navigation wikiPageWikiLink Longitude_by_chronometer.
- Celestial_navigation wikiPageWikiLink Lunar_distance_(navigation).
- Celestial_navigation wikiPageWikiLink Marine_chronometer.
- Celestial_navigation wikiPageWikiLink Mariners_astrolabe.
- Celestial_navigation wikiPageWikiLink Mars_Exploration_Rover.
- Celestial_navigation wikiPageWikiLink Measuring_instrument.
- Celestial_navigation wikiPageWikiLink Merchant_navy.
- Celestial_navigation wikiPageWikiLink Meridian_altitude.
- Celestial_navigation wikiPageWikiLink Minute_and_second_of_arc.
- Celestial_navigation wikiPageWikiLink Nautical_almanac.
- Celestial_navigation wikiPageWikiLink Nautical_chart.
- Celestial_navigation wikiPageWikiLink Nautical_mile.
- Celestial_navigation wikiPageWikiLink Navigation.
- Celestial_navigation wikiPageWikiLink Octant_(instrument).
- Celestial_navigation wikiPageWikiLink Pilot_(aeronautics).
- Celestial_navigation wikiPageWikiLink Planetarium.
- Celestial_navigation wikiPageWikiLink Polar_alignment.
- Celestial_navigation wikiPageWikiLink Polaris.
- Celestial_navigation wikiPageWikiLink Polynesian_navigation.
- Celestial_navigation wikiPageWikiLink Position_line.
- Celestial_navigation wikiPageWikiLink Quartz_clock.
- Celestial_navigation wikiPageWikiLink Radio_navigation.
- Celestial_navigation wikiPageWikiLink Reconnaissance_aircraft.
- Celestial_navigation wikiPageWikiLink Royal_Air_Force.
- Celestial_navigation wikiPageWikiLink Satellite_navigation.
- Celestial_navigation wikiPageWikiLink Sextant.
- Celestial_navigation wikiPageWikiLink Ships_bell.
- Celestial_navigation wikiPageWikiLink Sight_reduction.
- Celestial_navigation wikiPageWikiLink Southern_Hemisphere.
- Celestial_navigation wikiPageWikiLink Spherical_geometry.
- Celestial_navigation wikiPageWikiLink Star_clock.
- Celestial_navigation wikiPageWikiLink Star_tracker.
- Celestial_navigation wikiPageWikiLink Thomas_Hubbard_Sumner.
- Celestial_navigation wikiPageWikiLink Time_signal.
- Celestial_navigation wikiPageWikiLink United_States.
- Celestial_navigation wikiPageWikiLink United_States_Air_Force.
- Celestial_navigation wikiPageWikiLink United_States_Naval_Academy.
- Celestial_navigation wikiPageWikiLink United_States_Navy.
- Celestial_navigation wikiPageWikiLink Watch.
- Celestial_navigation wikiPageWikiLink Weather.
- Celestial_navigation wikiPageWikiLink World_War_II.
- Celestial_navigation wikiPageWikiLink Zenith.
- Celestial_navigation wikiPageWikiLink File:Marine_sextant.svg.