An infinite-axis telescope is a telescope that can move freely in all directions. Such telescopes can be mechanically simple hand-guided versions with...

Infinite-axis telescope (Ball mount) Astronomy portal Solar System portal Spaceflight portal Lists of telescopes List of largest infrared telescopes List...

Huygens' telescope set up at the Old Observatory in Leiden Huygens' Telescope closeup History of the telescope Infinite-axis telescope List of telescope types...

comparable price point and wide-field telescope. Infinite-axis telescope "Edmund Scientific: Astroscan Telescope". Edmund Scientific Corporation. Archived...

The Event Horizon Telescope (EHT) is a telescope array consisting of a global network of radio telescopes. The EHT project combines data from several...

simple optical telescopes, see Refracting telescope § Refracting telescope designs. Cylindrical lenses have curvature along only one axis. They are used...

90°, the azimuth axis must rotate very quickly; if the altitude is exactly 90°, the speed is infinite. Thus, altazimuth telescopes, although they can...

look bigger by allowing the user to hold them closer to their eye. A telescope, which uses its large objective lens or primary mirror to create an image...

as the angles made by all rays with the optical axis (the symmetrical axis of the system) are infinitely small, i.e., with infinitesimal objects, images...

accommodate rotation about one axis, leaving the suspended object effectively locked (i.e. unable to rotate) around that axis. The problem can be generalized...

(with a ≠ 0 {\displaystyle a\neq 0} ) is a parabola with its axis parallel to the y-axis. Conversely, every such parabola is the graph of a quadratic...

communications, and spacecraft communication antennas. They are also used in radio telescopes. The other large use of parabolic antennas is for radar antennas,: p.302 ...

are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems, like...

of the same Abbe number, to be used with a relaxed eye and a telescope with an infinitely distant objective then the separation is given by: d = 1 2 (...

the Queen of Oz in L. Frank Baum's fantasy books. Drake used a radio telescope 26 metres (85 ft) in diameter at Green Bank, West Virginia, to examine...

thermoscope and the inventor of various military compasses. With an improved telescope he built, he observed the stars of the Milky Way, the phases of Venus...

active galaxy. airborne observatory An airplane with an astronomical telescope. albedo A measure of the proportion of the total solar radiation received...

philosophers, as early as Anaximander, introduce the idea of multiple or even infinite universes. Democritus further detailed that these worlds varied in distance...

John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia...

In geometry, a paraboloid is a quadric surface that has exactly one axis of symmetry and no center of symmetry. The term "paraboloid" is derived from parabola...

Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s, most astronomers thought that the Milky...

intensity at the image center (intersection of the optical axis with the focal plane) due to an on-axis source; in most important cases these definitions result...

after ʻOumuamua. It was discovered by the Crimean amateur astronomer and telescope maker Gennadiy Borisov on 29 August 2019 UTC (30 August local time). 2I/Borisov...

in rotation around the Sun, and introduced Earth's daily rotation on its axis. While Copernicus's work sparked the "Copernican Revolution", it did not...

celestial sphere is stationary. The celestial sphere can be considered to be infinite in radius. This means any point within it, including that occupied by the...

proved too insignificant for his telescope, but he instead discovered the aberration of light and the nutation of Earth's axis, and catalogued 3,222 stars...

center of the Universe. Many mythological cosmologies included an axis mundi, the central axis of a flat Earth that connects the Earth, heavens, and other realms...

supermassive black holes have been directly imaged by the Event Horizon Telescope: the black hole in the giant elliptical galaxy Messier 87 and the black...

useful distances for stars out to a few hundred parsecs. The Hubble Space Telescope's Wide Field Camera 3 has the potential to provide a precision of 20 to...

ground-based and other space-based observatories the James Webb Space Telescope (JWST) is expected to give more insight into exoplanet traits, such as...