What does herschelian telescope mean?
Definitions for herschelian telescope
her·sche·lian tele·scope
This dictionary definitions page includes all the possible meanings, example usage and translations of the word herschelian telescope.
Princeton's WordNet
Herschelian telescope, off-axis reflectornoun
a reflecting telescope with the mirror slightly tilted to throw the image to the side where it can be viewed
Wikipedia
herschelian telescope
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives. Almost all of the major telescopes used in astronomy research are reflectors. Many variant forms are in use and some employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a catoptric telescope. From the time of Newton to the 1800s, the mirror itself was made of metal – usually speculum metal. This type included Newton's first designs and even the largest telescopes of the 19th century, the Leviathan of Parsonstown with a 1.8 meter wide metal mirror. In the 19th century a new method using a block of glass coated with very thin layer of silver began to become more popular by the turn of the century. Common telescopes which led to the Crossley and Harvard reflecting telescopes, which helped establish a better reputation for reflecting telescopes as the metal mirror designs were noted for their drawbacks. Chiefly the metal mirrors only reflected about 2⁄3 of the light and the metal would tarnish. After multiple polishings and tarnishings, the mirror could lose its precise figuring needed. Reflecting telescopes became extraordinarily popular for astronomy and many famous telescopes, such as the Hubble Space Telescope, and popular amateur models use this design. In addition, the reflection telescope principle was applied to other electromagnetic wavelengths, and for example, X-ray telescopes also use the reflection principle to make image-forming optics.
ChatGPT
herschelian telescope
A Herschelian telescope is a type of reflecting telescope, invented by William Herschel in the 18th century. The design features a large primary mirror tilted at a slight angle to the axis of the telescope tube, allowing it to serve as both a primary mirror and a diagonal mirror. This configuration allows the light to be reflected off to the side of the tube at a comfortable angle for viewing, without the need for a secondary mirror. As a result, the image viewed has no secondary mirror obstruction. The design is inherently free of coma, an optical aberration, on-axis, and it is free of astigmatism at the edge of the field. However, it introduces some distortion in the shape of viewed objects, due to the tilt of the mirror. This is known as astigmatism-like field curvature. It is less commonly used today due to these distortions and most modern telescope designs include a secondary mirror.
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Numerology
Chaldean Numerology
The numerical value of herschelian telescope in Chaldean Numerology is: 9
Pythagorean Numerology
The numerical value of herschelian telescope in Pythagorean Numerology is: 4
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"herschelian telescope." Definitions.net. STANDS4 LLC, 2024. Web. 19 Mar. 2024. <https://www.definitions.net/definition/herschelian+telescope>.
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