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The Gregorian telescope is a type of reflecting telescope designed by Scottish mathematician and astronomer, James Gregory in the 17th century. Ritchey 24 reflecting telescope A reflecting telescope (reflector) is an optical telescope which uses mirrors to reflect light, rather than lenses to pass light. ...
Royal motto: Nemo me impune lacessit (English: No one provokes me with impunity) Scotlands location within the UK Languages English, Gaelic, Scots Capital Edinburgh Largest city Glasgow First Minister Jack McConnell Area - Total - % water Ranked 2nd UK 78,782 km² 1. ...
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An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ...
James Gregory James Gregory (November 1638 – October 1675), was a Scottish mathematician and astronomer. ...
(16th century - 17th century - 18th century - more centuries) As a means of recording the passage of time, the 17th century was that century which lasted from 1601-1700. ...
 Diagram of the lightpath through a Gregorian telescope. He described the design in his 1663 publication Optica Promota (The Advance of Optics). Early attempts to build a Gregorian telescope failed, and it wasn't until ten years later, aided by the interest of experimental scientist Robert Hooke, that a working instrument was actually constructed. Gregory's design pre-dates the familiar form of reflector which Sir Isaac Newton first designed and made around 1670. // Events Prix de Rome scholarship established for students of the arts. ...
A portrait, claimed by historian Lisa Jardine to be of Robert Hooke Robert Hooke, FRS (July 18, 1635 - March 3, 1703), one of the greatest experimental scientists of the seventeenth century, played an important role in the scientific revolution. ...
Sir Isaac Newton, PRS (4 January [O.S. 25 December 1642] 1643 – 31 March [O.S. 20 March] 1727) was an English physicist, mathematician, astronomer, alchemist, inventor and natural philosopher who is regarded by many as the most influential scientist in history. ...
1670 was a common year beginning on a Saturday in countries using the Julian calendar and a Wednesday in countries using the Gregorian calendar. ...
The Gregorian telescope consists of two concave mirrors; the primary mirror collects the light and brings it to a focus at the secondary mirror where it is reflected back through a hole in the centre of the primary, and thence out the bottom end of the instrument where it can be viewed with the aid of the eyepiece. This design of telescope renders an upright image, making it useful for terrestrial observations. A mirror is a surface with good specular reflection that is smooth enough to form an image. ...
The focus or image point is the point where light rays, originating from a point in the object, converge [1]. The principal focus or focal point of a lens or parabolic mirror is the point onto which collimated light parallel to the axis is focused. ...
An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. ...
The Gregorian design has the advantage over Newton's design, in that it requires a shorter tube for the same focal length. The design was largely superseded by the Cassegrain telescope, and is not commonly in use today, other than for spotting scopes. The focal point F and focal length f of a positive lens, a negative lens, a concave mirror, and a convex mirror. ...
Light path in a Cassegrain reflector First developed in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. ...
A spotting scope is a portable telescope, optimized for the observation of terrestrial objects. ...
See also Ritchey 24 reflecting telescope A reflecting telescope (reflector) is an optical telescope which uses mirrors to reflect light, rather than lenses to pass light. ...
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