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- Rectangulus abstract "The rectangulus was an astronomical instrument made by Richard of Wallingford around 1326. Dissatisfied with the limitations of existing astrolabes, Richard developed the rectangulus as an instrument for spherical trigonometry and to measure the angles between planets and other astronomical bodies. This was one of a number of instruments he created, including the Albion, a form of equatorium, and a famously complicated and expensive horologium or astronomical clock.His Tractus Rectanguli, describing the rectangulus, was an influential text in medieval astronomy and at least thirty copies were known to survive. His Quadripartitum was the first text on spherical trigonometry to be published in Western Europe.The rectangulus was a form of skeleton torquetum. This was a series of nested angular scales, so that measurements in azimuth and elevation could be made directly in polar coordinates, relative to the ecliptic. Conversion from these coordinates though was difficult, involving what was the leading mathematics of the day. The rectangulus was an analogue computing device to simplify this: instead of measuring in angular measurements it could resolve the angles to Cartesian components directly. This then simplified the further calculations.The rectangulus was constructed as a brass pillar with a number of linear scales hinged above it. Pinhole sights on the upper arm allowed it to be pointed accurately at the astronomical target. Plumb bob lines descended from the scales above and intersected with linear scales marked on the horizontal scales below. These allowed measures to be read, not as angles, but as trignometric ratios.To celebrate the 600th anniversary of the Rectangulus in 1926 a replica was constructed. This is now in the Museum of the History of Science, Oxford.".
- Rectangulus wikiPageID "49452645".
- Rectangulus wikiPageLength "4112".
- Rectangulus wikiPageOutDegree "15".
- Rectangulus wikiPageRevisionID "705667803".
- Rectangulus wikiPageWikiLink Astrolabe.
- Rectangulus wikiPageWikiLink Astronomical_clock.
- Rectangulus wikiPageWikiLink Astronomical_instrument.
- Rectangulus wikiPageWikiLink Cartesian_coordinate_system.
- Rectangulus wikiPageWikiLink Category:Astronomical_instruments.
- Rectangulus wikiPageWikiLink Category:Historical_scientific_instruments.
- Rectangulus wikiPageWikiLink Category:Mathematical_tools.
- Rectangulus wikiPageWikiLink Category:Mechanical_calculators.
- Rectangulus wikiPageWikiLink Ecliptic.
- Rectangulus wikiPageWikiLink Equatorium.
- Rectangulus wikiPageWikiLink Horologium.
- Rectangulus wikiPageWikiLink Museum_of_the_History_of_Science,_Oxford.
- Rectangulus wikiPageWikiLink Richard_of_Wallingford.
- Rectangulus wikiPageWikiLink Spherical_trigonometry.
- Rectangulus wikiPageWikiLink Torquetum.
- Rectangulus wikiPageWikiLinkText "Rectangulus".
- Rectangulus wikiPageWikiLinkText "rectangulus".
- Rectangulus colwidth "35".
- Rectangulus wikiPageUsesTemplate Template:Reflist.
- Rectangulus subject Category:Astronomical_instruments.
- Rectangulus subject Category:Historical_scientific_instruments.
- Rectangulus subject Category:Mathematical_tools.
- Rectangulus subject Category:Mechanical_calculators.
- Rectangulus hypernym Instrument.
- Rectangulus type Agent.
- Rectangulus comment "The rectangulus was an astronomical instrument made by Richard of Wallingford around 1326. Dissatisfied with the limitations of existing astrolabes, Richard developed the rectangulus as an instrument for spherical trigonometry and to measure the angles between planets and other astronomical bodies.".
- Rectangulus label "Rectangulus".
- Rectangulus sameAs Q22908192.
- Rectangulus sameAs Q22908192.
- Rectangulus wasDerivedFrom Rectangulus?oldid=705667803.
- Rectangulus isPrimaryTopicOf Rectangulus.