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Three Mariner's Astrolabes in the Museum of the Forte da Ponta da Bandeira; Lagos, Portugal. The mariner's astrolabe, also called sea astrolabe, was an inclinometer used to determine the latitude of a ship at sea by measuring the sun's noon altitude (declination) or the meridian altitude of a star of known declination.
Ephemeris by Abraham Zacuto in Almanach Perpetuum, 1496. In the thirteenth century celestial navigation was already known, guided by the sun position. For celestial navigation the Portuguese, like other Europeans, used Arab navigation tools, like the astrolabe and quadrant, which they made easier and simpler.
The first known metal astrolabe in Western Europe is the Destombes astrolabe made from brass in the eleventh century in Portugal. [ 27 ] [ 28 ] (p 140) Metal astrolabes avoided the warping that large wooden ones were prone to, allowing the construction of larger and therefore more accurate instruments.
The mariner's astrolabe also measured the altitude of celestial bodies; it was developed from the so-called planispheric astrolabe, an analogue computer to solve a set of astronomical problems. In contrast with the planispheric astrolabe the Mariner's astrolabe cannot perform calculations but only be used to obtain the height of a celestial ...
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...
Aim for Consistency. A 2019 study found that participants who were consistent with what time of day they exercised reported that they worked more frequently and for longer durations, so they were ...
The creation of new inventions in Portugal was at its peak during the Age of Discovery.These inventions consisted mainly in the improvement of devices and techniques of ocean navigation and coastal cartography, such as the mariner's astrolabe and the chart of latitudes.
Tivaj Hopkins weighed 400 pounds at 17 years old. He lost weight walking, strength training and a high-protein diet and is a personal trainer for Planet Fitness.