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A filar micrometer attached to a telescope. A filar micrometer is a specialized eyepiece used in astronomical telescopes for astrometry measurements, in microscopes for specimen measurements, and in alignment and surveying telescopes for measuring angles and distances on nearby objects.
Micrometers are also used in telescopes and microscopes to measure the apparent diameter of celestial bodies or microscopic objects. The micrometer used with a telescope was invented about 1638 by William Gascoigne, an English astronomer. [2]
William Gascoigne (1612 – 2 July 1644) was an English astronomer, mathematician and maker of scientific instruments from Middleton, Leeds who invented the micrometer and the telescopic sight. He was one of a group of astronomers in the north of England who followed the astronomy of Johannes Kepler , which included Jeremiah Horrocks and ...
Gautier also made innovations to the micrometer to reduce errors in measurement. He worked on a large refractor with a 132 cm diameter lens for the 1900 Paris exhibition financed by the French politician François Deloncle and his private society, however this was a disaster as the telescope was not placed in an appropriate location and failure ...
Radio telescopes are frequently diffraction-limited, because the wavelengths they use (from millimeters to meters) are so long that the atmospheric distortion is negligible. Space-based telescopes (such as Hubble, or a number of non-optical telescopes) always work at their diffraction limit, if their design is free of optical aberration.
Telescopes at CTIO include the Victor M. Blanco Telescope (named after astronomer Victor Manuel Blanco in 1995) which employs a wide-field of view CCD (Charge-coupled device), a wide field of view near infrared imager (1-2.5 micrometers) and a multi-object fiber fed spectrograph working at visible wavelengths.
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The Caltech Submillimeter Observatory at Mauna Kea Observatory was commissioned in 1988, and has a 10.4 m (34 ft) dish. Submillimetre astronomy or submillimeter astronomy (see spelling differences) is the branch of observational astronomy that is conducted at submillimetre wavelengths (i.e., terahertz radiation) of the electromagnetic spectrum.