He is considered the founder of trigonometry but is most famous for his incidental discovery of precession of the equinoxes.

His other reputed achievements include the discovery of Earth's precession, the compilation of the first comprehensive star catalog of the western world, and possibly the invention of the astrolabe, also of the armillary sphere, which he used during the creation of much of the star catalogue.

Taking a different view from other modern scholars, Ulansey argues that the Mithraic mysteries began in the Greco-Roman world as a religious response to the discovery by the Greek astronomer Hipparchus of the astronomical phenomenon of the precession of the equinoxes – a discovery that amounted to discovering that the entire cosmos was moving in a hitherto unknown way.

Ptolemy lived in the 2nd century AD, three centuries after the discovery of the precession of the equinoxes by Hipparchus around 130 BC, but he ignored the problem by dropping the concept of a fixed celestial sphere and adopting what is referred to as a tropical coordinate system instead.

Though there is still-controversial evidence that Aristarchus of Samos possessed distinct values for the sidereal and tropical years as early as c. 280 BC, the discovery of precession is usually attributed to Hipparchus ( 190 – 120 BC ) of Rhodes or Nicaea, a Greek astronomer.

He suggests the cult may have been inspired by Hipparchus ' discovery of precession.

Ptolemy explains Hipparchus ' discovery of the precession of the equinoxes and begins explaining the theory of epicycles.

The Qadimi ( traditional ) Zoroastrian calendar puts the month of Dae ( pronounced " Day ") with the Sun entering the constellation of Taurus ( specifically the Pleiades ); thus apparently ( theory ) recalling the time of the origination of the zoroastrian calendar, and its relation to the discovery of the precession.

This discovery of the relativistic precession of the electron spin led to the understanding of the significance of the relativistic effect.

An operational approach to sociology can never expect abstract certainty, since it is certainty which every new discovery in science either replaces or reshapes.

Whosever fault, it is evident that Brumidi intended to fill out the whole frieze with his `` histories '' and come full circle with the scene of the discovery of California gold.

A year and a day of this idyll is described for the reader, one in which not only discovery of a new world of personality is charted, but self-discovery as well.

a discovery are also high ) and effect size ( when the effect is

A less confrontational vision of scientific discovery is proposed by Adloff He suggests that hindsight criticism of the early publications should be mitigated by the nascent state of radiochemistry, highlights the prudence of Debierne's claims in the original papers, and notes that nobody can contend that Debierne's substance did not contain actinium.

The true beginning of atomic physics is marked by the discovery of spectral lines and attempts to describe the phenomenon, most notably by Joseph von Fraunhofer.

Hunley is raised to the surface after 136 years on the ocean floor and 30 years after its discovery by undersea explorer E. Lee Spence and 5 years after being filmed by a dive team funded by novelist Clive Cussler.

" Eleanor Audeley ", wife of Sir John Davies, is said to have been brought before the High Commission in 1634 for extravagances, stimulated by the discovery that her name could be transposed to " Reveale, O Daniel ", and to have been laughed out of court by another anagram submitted by Sir John Lambe, the dean of the Arches, " Dame Eleanor Davies ", " Never soe mad a ladie ".

Galileo announced his discovery that Venus had phases like the Moon in the form " Haec immatura a me iam frustra leguntur-oy " ( Latin: These immature ones have already been read in vain by me-oy ), that is, when rearranged, " Cynthiae figuras aemulatur Mater Amorum " ( Latin: The Mother of Loves Venus imitates the figures of Cynthia the moon ).

In September of 1820, Ampère ’ s friend and eventual eulogist François Arago showed the members of the French Academy of Sciences the surprising discovery of Danish physicist Hans Christian Ørsted that a magnetic needle is deflected by an adjacent electric current.

Since the first discovery in 1884, fossils of more than thirty individuals have been recovered, providing scientists with a more detailed knowledge of Albertosaurus anatomy than is available for most other tyrannosaurids.

* 1943 – World War II: The discovery of a mass grave of Polish prisoners of war killed by Soviet forces in the Katyń Forest Massacre is announced, causing a diplomatic rift between the Polish government in exile in London from the Soviet Union, which denies responsibility.

He is credited with the discovery of the element arsenic and experimented with photosensitive chemicals, including silver nitrate.

One strategy to address bacterial drug resistance is the discovery and application of compounds that modify resistance to common antibacterials.

" It is highly probable that the correct information about the sulphonamide did not reach the newspapers because, since the original sulphonamide antibacterial, Prontosil, had been a discovery by the German laboratory Bayer, and as Britain was at war with Germany at the time, it was thought better to raise British morale by associating Churchill's cure with the British discovery, penicillin.

His discovery of penicillin had changed the world of modern medicine by introducing the age of useful antibiotics ; penicillin has saved, and is still saving, millions of people around the world.

However the exact relationship of the term Ahhiyawa to the Achaeans beyond a similarity in pronunciation is hotly debated by scholars, even following the discovery that Mycenaean Linear B is an early form of Greek ; the earlier debate was summed up in 1984 by Hans G. Güterbock of the Oriental Institute.

One of his most celebrated achievements is the discovery of the first arithmetic Weil cohomology theory: the ℓ-adic étale cohomology.

Analytical chemistry plays an increasingly important role in the pharmaceutical industry where, aside from QA, it is used in discovery of new drug candidates and in clinical applications where understanding the interactions between the drug and the patient are critical.

Most cases that go to trial are carefully prepared through a discovery process that aids in the review of evidence and testimony before it is presented to judge or jury.

However, there is no record of this incident in Bradley's own account of the discovery, and it may therefore be apocryphal.

The discovery and elucidation of aberration is now regarded as a classic case of the application of scientific method, in which observations are made to test a theory, but unexpected results are sometimes obtained that in turn lead to new discoveries.

In the 1980s, there was a dramatic growth in research and applications of Bayesian methods, mostly attributed to the discovery of Markov chain Monte Carlo methods, which removed many of the computational problems, and an increasing interest in nonstandard, complex applications.

The discovery of differential cryptanalysis is generally attributed to Eli Biham and Adi Shamir in the late 1980s, who published a number of attacks against various block ciphers and hash functions, including a theoretical weakness in the Data Encryption Standard ( DES ).

Possibly the earliest and nearest approach to the discovery of the identity of lightning, and electricity from any other source, is to be attributed to the Arabs, who before the 15th century had the Arabic word for lightning ( raad ) applied to the electric ray.

The discovery of this phenomenon when passing light through a prism is famously attributed to Isaac Newton.

The discovery of persistence of vision is attributed to the Roman poet Lucretius, although he only mentions it in connection

The discovery of penicillin is attributed to Scottish scientist and Nobel laureate Alexander Fleming in 1928.

The loss of endemic vegetation, birds and other fauna, much of it within the first 50 years of discovery, can be attributed to the impact of humans and their introduction of goats, pigs, dogs, cats, rats as well as the introduction of non-endemic birds and vegetation into the island.

NB: It is known today that this discovery was erroneously attributed to William Jones.

The discovery of this tendency is attributed to Maurice Duverger, a French sociologist who observed the effect and recorded it in several papers published in the 1950s and 1960s.

The discovery of the islands of São Tomé and Príncipe is also attributed to these same sailors.

In the 1980s, there was a dramatic growth in research and applications of Bayesian methods, mostly attributed to the discovery of Markov chain Monte Carlo methods, which removed many of the computational problems, and an increasing interest in nonstandard, complex applications.

Aristotle attributed to Socrates the discovery of the method of definition and induction, which he regarded as the essence of the scientific method.

The discovery of infrared radiation is attributed to William Herschel, who performed an experiment where he placed a thermometer in sunlight of different colors after it passed through a prism.

The discovery is attributed to Mitsuru Matsui, who first applied the technique to the FEAL cipher ( Matsui and Yamagishi, 1992 ).

Numerous " firsts " in medical research, clinical care, and chemistry are attributed to him, including being the first to differentiate smallpox from measles, and the discovery of numerous compounds and chemicals including kerosene, among others.

The earliest surviving account of St. Catherine's life comes over 500 years after the traditional date of her martyrdom, in the monologium attributed to Emperor Basil I ( 866 ), although the rediscovery of her relics at Saint Catherine's Monastery, Mount Sinai was about 800, and presumably implies an existing cult at that date ( the common name of the monastery developed after the discovery ).

The discovery of Janus is attributed to its first observer: Audouin Dollfus, on December 15, 1966.

After the discovery it was recognized that fragments of these sayings attributed to Jesus appeared in manuscripts discovered at Oxyrhynchus in 1898 ( P. Oxy.

In addition the first proof of the fundamental theorem of calculus and the discovery of the Taylor series can both be attributed to him.

Elton Mayo's work has been widely attributed to the discovery the ' social person ', allowing for workers to be seen as individuals rather than merely robots designed to work for unethical and unrealistic productivity expectations.

The discovery of the cause of Coeliac disease may also be partly attributed to the Dutch famine.

The discovery of the long-term deterioration in the terms of trade for underdeveloped countries must be attributed to Hans W. Singer.

The discovery of the rotating magnetic field is generally attributed to two inventors, the Italian physicist and electrical engineer Galileo Ferraris, and the Austrian / Serbian inventor and electrical engineer Nikola Tesla.

It is generally attributed to Thales, who is said to have sacrificed an ox in honor of the discovery, but sometimes it is attributed to Pythagoras.