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In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]
If the azimuth is between 180° and 360° (south–west–north), the object is setting. There are the following special cases: [ a ] All directions are south when viewed from the North Pole , and all directions are north when viewed from the South Pole , so the azimuth is undefined in both locations.
A theodolite (/ θ i ˈ ɒ d ə ˌ l aɪ t /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying , but it is also used extensively for building and infrastructure construction , and some specialized applications such ...
A large German equatorial mount on the Forststernwarte Jena 50cm Cassegrain reflector telescope. An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis, called polar axis, parallel to the Earth's axis of rotation. [1] [2] This type of mount is used for astronomical telescopes and cameras.
Altazimuth mount, a two-axis telescope mount Topics referred to by the same term This disambiguation page lists articles associated with the title Altitude-azimuth .
Until roughly the 1960s, altazimuth mounts were considered a poor alternative to equatorial mounts due to their inability to follow diurnal motion by rotation about a single axis. [ 1 ] Moved above to talk because Albert G. Ingalls would not be a source on this, he was dead before the 1960's and therefor could not make a comparison of ...
On first blush, it might appear to be a documentary of the esteemed country singer Elizabeth Cook, who enjoys a sizable following for an independent artist, between her nearly 25-year discography ...
A short mvet with four strings and a single central resonator. The mvet or mvett is a stringed musical instrument, a type of stick zither, Hornbostel-Sachs (311) of the Fang people of Gabon, Cameroon, Democratic Republic of the Congo, São Tomé and Equatorial Guinea.