29 relations: Allan Chapman (historian), Apochromat, Apparent magnitude, Astronomy Centre, Barnsley, BBC, Celestron, Doncaster, England, F-number, H-alpha, Hoober Observatory, Hoober Stand, Lunar eclipse, Meteor shower, Mexborough, Newtonian telescope, Observatory, Refracting telescope, Rotherham, Schmidt–Cassegrain telescope, Software Bisque, South Yorkshire, Swinton, South Yorkshire, Takahashi Seisakusho, Todmorden, Vixen (telescopes), Wadham College, Oxford, Wentworth, South Yorkshire.
Allan Chapman FRAS (born 30 May 1946) is a British historian of science.
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
The Astronomy Centre, also known as the Amateur Astronomy Centre, is an astronomical observatory located in northern England which is run by experienced amateur astronomers and is open to the public at certain times.
Barnsley (locally) is a town in South Yorkshire, England, located halfway between Leeds and Sheffield.
The British Broadcasting Corporation (BBC) is a British public service broadcaster.
Celestron is a company based in Torrance, California, USA that manufactures telescopes and distributes telescopes, binoculars, spotting scopes, microscopes, and accessories manufactured by its parent company, the Synta Technology Corporation of Taiwan.
Christmas is an annual festival commemorating the birth of Jesus Christ,Martindale, Cyril Charles.
The Christmas season, also called the festive season, or the holiday season (mainly in the U.S. and Canada; often simply called the holidays),, is an annually recurring period recognized in many Western and Western-influenced countries that is generally considered to run from late November to early January.
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus.
Christmas traditions vary from country to country.
Doncaster is a large market town in South Yorkshire, England.
England is a country that is part of the United Kingdom.
The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.
H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series with a wavelength of 656.28 nm in air; it occurs when a hydrogen electron falls from its third to second lowest energy level.
J A Jones Hoober Observatory is a privately owned observatory located in South Yorkshire, England near to the villages of Hoober and Wentworth, North-northwest of Rotherham.
Hoober Stand is a tower and Grade II* listed building on a ridge in Wentworth, South Yorkshire in northern England.
A lunar eclipse occurs when the Moon passes directly behind Earth and into its shadow.
A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.
Mexborough is a town in the Metropolitan Borough of Doncaster in South Yorkshire, England.
New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.
New Year's Day, also called simply New Year's or New Year, is observed on January 1, the first day of the year on the modern Gregorian calendar as well as the Julian calendar.
In the Gregorian calendar, New Year's Eve (also known as Old Year's Day or Saint Sylvester's Day in many countries), the last day of the year, is on 31 December which is the seventh day of Christmastide.
The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror.
An observatory is a location used for observing terrestrial or celestial events.
A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).
Rotherham is a large town in South Yorkshire, England, which together with its conurbation and outlying settlements to the north, south and south-east forms the Metropolitan Borough of Rotherham, with a recorded population of 257,280 in the 2011 census.
The Schmidt–Cassegrain is a catadioptric telescope that combines a Cassegrain reflector's optical path with a Schmidt corrector plate to make a compact astronomical instrument that uses simple spherical surfaces.
Software Bisque, Inc. (formerly named Computer Assist Services) is a corporation based in Golden, Colorado USA that develops robotics telescope mounts and accessories, and publishes software used in astronomy.
South Yorkshire is a metropolitan county in England.
Swinton is a suburban town within the Metropolitan Borough of Rotherham, in South Yorkshire, England on part of the west bank of the River Don.
Takahashi Seisakusho is a Japanese manufacturer of telescopes and related equipment, such as eyepieces and mounts.
Todmorden (locally or) is a market town and civil parish in the Upper Calder Valley in Calderdale, West Yorkshire, England.
Vixen is a Japanese company that makes telescopes, binoculars, spotting scopes and accessories for their products.
Wadham College is one of the constituent colleges of the University of Oxford in the United Kingdom.
Wentworth is a village and civil parish in the Metropolitan Borough of Rotherham in South Yorkshire, England.
2018 has been designated as the third International Year of the Reef by the International Coral Reef Initiative.
2019 (MMXIX) will be a common year starting on Tuesday of the Gregorian calendar, the 2019th year of the Common Era (CE) and Anno Domini (AD) designations, the 19th year of the 3rd millennium, the 19th year of the 21st century, and the 10th and last year of the 2010s decade.
Hoober observatory, J A Jones Hoober Observatory, J. A. Jones Hoober Observatory, Mexborough & Swinton Astronomical Society, Mexborough And Swinton Night Sky Astronomy Club, Mexborough and Swinton Astronomical Society, Mexborough and Swinton Night Sky Astronomy Club.