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In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts.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]
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.
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 ...
Altazimuth, altitude-azimuth, or alt-az mounts allow telescopes to be moved in altitude (up and down), or azimuth (side to side), as separate motions. This mechanically simple mount was used in early telescope designs and until the second half of the 20th century was used as a "less sophisticated" alternative to equatorial mounts since it did ...
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 ...
“The Easy Kind” isn’t the easiest kind of film to describe for someone who is getting a first look, as audiences did in its premiere screenings at the Telluride Film Festival this past weekend.
A large portable Newtonian telescope on an altazimuth mount with a third equatorial axis platform mount consisting of a pivot and radius bearing surfaces.. An equatorial platform or equatorial table is an equatorial telescope mount in the form of a specially designed platform that allows any device sitting on it to track astronomical objects in the sky on an equatorial axis. [1]