Many of the constellations and star names in use today derive from Greek astronomy.

Delambre was one of the first astronomers to derive astronomical equations from analytical formulas, was the author of Delambre's Analogies and, after the age of 70, also the author of works on the history of astronomy like the Histoire de l ' astronomie.

As a young man, he distinguished himself as a Talmudist, yet he also studied the secular sciences, particularly mathematics and astronomy ; he is said to have been the first to derive a method for the extraction of the cube root.

In astronomy, the brightness of an object is given in terms of its absolute magnitude.

Since it is apparent magnitudes which are actually measured at a telescope, this way of looking at things serves to highlight the fact that many discussions about distances in astronomy are really discussions about the putative or derived absolute magnitudes of the distant objects being observed.

On the one hand, Descartes begins with a doubt of anything which cannot be known with absolute certainty and includes in this realm of doubt the impressions of sense perception, and thus, “ all sciences of corporal things, such as physics and astronomy.

In astronomy, Celsius began a series of observations using colored glass plates to record the magnitude ( a measure of brightness ) of certain stars.

Used in astronomy to determine the magnitude and spectral class of a star.

In astronomy, the Zenithal Hourly Rate ( ZHR ) of a meteor shower is the number of meteors a single observer would see in one hour under a clear, dark sky ( limiting apparent magnitude of 6. 5 ) if the radiant of the shower were at the zenith.

In astronomy it is the algebraic or numerical expression of the magnitude of the inequalities in a planet's motion that remain after the inequalities of a short period have been allowed for.

Richter chose to use the term " magnitude " to describe an earthquake's strength because of his early interest in astronomy ; stargazers use the word to describe the brightness of stars.

The position coordinates locate the object on the sky using the techniques of spherical astronomy, and the magnitude determines its brightness as seen from the Earth.

In astronomy, limiting magnitude is the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument.

In amateur astronomy, limiting magnitude frequently refers to the faintest stars that can be seen with the unaided eye near the zenith on clear moonless nights.

* S, a unit of measurement of surface brightness used in astronomy and defined as the surface brightness of a star whose visual magnitude is 10 and whose light is smeared over one square degree ( see also: Sky brightness )

In astronomy, the apparent brightness of a star, or any other luminous object, is called the apparent magnitude.

The formal displacement of the geocentric principle far from being Copernicus' primary concern, was introduced only to resolve what seemed to him intolerable in orthodox astronomy, namely, the ' unphysical ' triplication of centric reference-points: one center from which the planet's distances were calculated, another around which planetary velocities were computed, and still a third center ( the earth ) from which the observations originated.

`` His interests range from astronomy and geology to electronics, tennis and swimming.

It is only within about the past century, however, that amateur astronomy has become an activity clearly distinguished from professional astronomy, and other related activities.

An early pioneer of radio astronomy was Grote Reber, an amateur astronomer who constructed the first purpose built radio telescope in the late 1930s to follow up on the discovery of radio wavelength emissions from space by Karl Jansky.

In Chinese astronomy, the stream of water flowing from the Water Jar was depicted as the " Army of Yu-Lin " ( Yu-lin-kiun ).

Apart from the fundamental function of providing astronomers with a reference frame to report their observations in, astrometry is also fundamental for fields like celestial mechanics, stellar dynamics and galactic astronomy.

Ampère engaged in a diverse array of scientific inquiries during the years leading up to his election to the academy — writing papers and engaging in topics from mathematics and philosophy to chemistry and astronomy.

He was educated at the Collège des Quatre-Nations ( also known as Collège Mazarin ) from 1754 to 1761, studying chemistry, botany, astronomy, and mathematics.

This word was first used by Robert Blair ( d. 1828 ), professor of practical astronomy at Edinburgh University, to characterize a superior achromatism, and, subsequently, by many writers to denote freedom from spherical aberration.

He was professor of astronomy at Uppsala University from 1730 to 1744, but traveled from 1732 to 1735 visiting notable observatories in Germany, Italy and France.

As such, it can be seen as connecting other disciplinary approaches for investigating ancient astronomy: astroarchaeology ( an obsolete term for studies that draw astronomical information from the alignments of ancient architecture and landscapes ), history of astronomy ( which deals primarily with the written textual evidence ), and ethnoastronomy ( which draws on the ethnohistorical record and contemporary ethnographic studies ).

The word chemistry comes from the word alchemy, an earlier set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism and medicine ; it is commonly thought of as the quest to turn lead or another common starting material into gold.

The oldest catalogues of stars and constellations are from Old Babylonian astronomy, beginning in the Middle Bronze Age.

Following his discovery of Pluto, Tombaugh earned bachelor's and master's degrees in astronomy from the University of Kansas in 1936 and 1938.

He worked at White Sands Missile Range in the early 1950s, and taught astronomy at New Mexico State University from 1955 until his retirement in 1973.

In a similar way, evidence about the history of the universe is drawn from astronomy, astrophysics, planetary geology, and physics.

At the University of Leipzig from 1876 to 1878, Husserl studied mathematics, physics, and astronomy.

Amort, who had the reputation of being the most learned man of his age, was a voluminous writer on every conceivable subject, from poetry to astronomy, from dogmatic theology to mysticism.

A Chinese historian of astronomy, Xi Zezong, has claimed that a " small reddish star " observed near Jupiter in 362 BC by Chinese astronomer Gan De may have been Ganymede, predating Galileo's discovery by around two millennia.

In astronomy, rotation is a commonly observed phenomenon.

The radiation from the protostar and early star has to be observed in infrared astronomy wavelengths, as the extinction caused by the rest of the cloud in which the star is forming is usually too big to allow us to observe it in the visual part of the spectrum.

In astronomy, the Arago spot can be also easily observed in the strongly defocussed image of a star in a Newtonian telescope.

* Apparent retrograde motion, in astronomy, is the apparent motion of planets as observed from a particular vantage point

Aurora ( astronomy ) | Aurora australis observed by Space Shuttle Discovery | Discovery, May 1991.

An equinox in astronomy is that moment in time ( not a whole day ) when the center of the Sun can be observed to be directly " above " the Earth's equator, occurring around March 20 and September 23 each year.

The scientific study of the night sky and bodies observed within it, meanwhile, takes place in the science of astronomy.

Strange phenomenon on 17 November 1882, observed and described by Maunder in The Observatory ( astronomy ) | The Observatory, June 1883 ( pp. 192-193 ) and April 1916 ( pp. 213-215 ), which he termed an " auroral beam " and " a strange celestial visitor.

" Drawing by astronomer and aurora ( astronomy ) | aurora expert John Rand Capron, Guildown Observatory, Surrey, UK, who also observed it.

A traditional division of observational astronomy is given by the region of the electromagnetic spectrum observed:

This wavelength or frequency falls within the microwave radio region of the electromagnetic spectrum, and it is observed frequently in radio astronomy, since those radio waves can penetrate the large clouds of interstellar cosmic dust that are opaque to visible light.

Owing to that vision, the study of the grand scale non-stationary phenomena, observed in the galaxies became the central subject of the extra-galaxy astronomy.

Neutrinos which are created in the cores of stars ( as a result of stellar fusion ) can be observed using neutrino astronomy.

At the age of 11 he observed Halley's comet, which started his fascination with astronomy.

Thales, so the story goes, because of his poverty was taunted with the uselessness of philosophy ; but from his knowledge of astronomy he had observed while it was still winter that there was going to be a large crop of olives, so he raised a small sum of money and paid round deposits for the whole of the olive-presses in Miletus and Chios, which he hired at a low rent as nobody was running him up ; and when the season arrived, there was a sudden demand for a number of presses at the same time, and by letting them out on what terms he liked he realized a large sum of money, so proving that it is easy for philosophers to be rich if they choose.

X-ray pulsars are observed using X-ray telescopes that are satellites in low Earth orbit although some observations have been made, mostly in the early years of X-ray astronomy, using detectors carried by balloons or sounding rockets.

The scientific study of the night sky and bodies observed within it, meanwhile, takes place in the science of astronomy.

One year later the solar neutrino deficit was first observed, and that was followed by the famous paper of Gribov and Pontecorvo published in 1969 titled " Neutrino astronomy and lepton charge ".

When infrared astronomy began, those previously annoying dust particles were observed to be significant and vital components of astrophysical processes.

Computed and observed the solar eclipses of 809AH, 810AH and 811AH, after being invited by Ulugh Bek, based in Samarqand to pursue his study of mathematics, astronomy and physics.

It is named in honor of William D. Ferris, an astronomy enthusiast who observed with the LONEOS project from 1998 to 2000.

He had been interested in astronomy as a child, reporting to have observed a comet in February, 1843.