Astrolabe is a collection of subroutines and applications for calculating the positions of the sun, moon, planets and other celestial objects. The emphasis is on high accuracy over a several thousand year time span.
An instrument for observing or showing the positions of the stars. It is now disused.
A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.
Ancient navigational instrument, which gave its name to several exploration ships over the centuries. Of note La Pérouse ship which disappeared at Solomon Island in 1780, then the first french ship to reach Antarctica in 1840 under the direction of Dumont d'Urville, and now the current ship running links between Tasmania and DdU five times per austral summer. Vomit inducer.
A mechanical device used by members of the Navigator's Guild to determine locations in the Abyss.
A small instrument of early astronomers and navigators, which used the constellations and horizon to locate position.
Astronomical instrument used by ancient Greeks and others to measure the angular height of celestial bodies in relation to the horizon. The seaman''s astrolabe was a simple device for measuring the altitude of the sun or a star for fixing one''s approximate latitude.
A navigational instrument used by a ship's pilot in the seventeenth-century to calculate the position of the stars and sun.
A circular instrument with a moveable arm for calculating the altitude of the sun and plotting the positions of the stars, for astronomical and navigational purposes. Astrolabes were used from the 2nd century, and although obsolete in Europe by the 18thC, forgeries continued to be made in the Middle East.
A 'star-taking' instrument formerly (in times past) used to take altitudes, and to solve other problems of practical astronomy.
Instrument which provided a flat representation of the skies, used to determine astronomical data (such as the altitude of the stars or the hour of day) and also used as a navigational aid. In addition, it provided astrological information for the drawing up of horoscopes.
an early form of sextant
a multi-functional instrument enabling the user to perform such diverse tasks as time-keeping (by both day and night), surveying, determining latitude and casting horoscopes
a navigational tool for sailors
a navigation instrument that determines the angular distance of a star above the horizon, and a caravel is a type of small sailing ship
an instrument that once was the most used, multipurpose astronomical instrument
an instrument that was used to determine african inventor the altitude of
an instrument that was used to determine the altitude of objects in
a projection of the three-dimensional celestial sphere on to two dimensions - in the same way as a map represents the projection of the earth on a flat piece of paper or other material
a set of movable plates that includes the rete, an openwork map showing the ecliptic, or path of the sun, and the brightest stars, and the tympan, an engraving of the principal coordinates of the celestial sphere, such as the horizon and the meridian
a two-dimensional model of the celestial sphere
a very important ancient navigation instrument for many hundred years
Early instrument for measuring the altitude of a celestial object.
A navigational tool that measures the altitude (distance above the horizon) of stars and can be used to determine latitude (your position north or south) for navigation. It could also be used for astrological and other purposes.
A navigational instrument used to measure the vertical angle between the horizon or the horizontal plane at the observer, and a celestial feature. An astrolabe is used to determine the geographic coordinates of points on the Earth's surface.
Ancient instrument used to calculate the position of the stars and other measurements.
A circular instrument used to observe and calculate the position of celestial bodies
Instrument used for celestial navigation. A large collection (more than 10) is displayed at the Museu de Marinha in Lisbon. Photo of astrolabe from the Batavia, courtesy Western Australia Maritime Museum. Illustration of usage.
An ancient instrument employed for measuring the angular position of Sun and stars, used also to project the celestial sphere on the plane of the equator.
A mechanical device, predecessor to the sextant, whereby mariners determined the time of day by the Sun, of the night by the stars, and the height and depth of mountains and valleys. â€“ Source: The Encyclopedia of Astrology
Tool for recording astrological calculations.
astronomical instrument based on a planispheric projection of the heavens, see article on the astrolabe.
an instrument, developed by Muslim navigators in the twelfth century, that allowed mariners to plot their latitude by determining the altitude of the sun and other celestial bodies. (p. 506)
ancient instrument used to measure the apparent heighth of the stars on the horizon. The modern sextant derives from the astrolabe.
A tool used by a Navigator. (See picture.)
The astrolabe is a historical astronomical instrument used by classical astronomers and astrologers. It was the chief navigational instrument until the invention of the sextant in the 18th century. Its many uses included locating and predicting the positions of the Sun, Moon, planets and stars; determining local time given local longitude and vice-versa; surveying; and triangulation.