Ancient Greek

Climatology (from Greek κλίμα, klima, "slope"; and -λογία, -logia) or climate science is the scientific study of Earth's climate, typically defined as weather conditions averaged over a period of at least 30 years. Climate concerns the atmospheric condition during an extended to indefinite period of time; weather is the condition of the atmosphere during a relative brief period of time. The main topics of research are the study of climate variability, mechanisms of climate changes and modern climate change. This topic of study is regarded as part of the atmospheric sciences and a subdivision of physical geography, which is one of the Earth sciences. Climatology includes some aspects of oceanography and biogeochemistry.

The main methods employed by climatologists are the analysis of observations and modelling of the physical processes that determine climate. Short term weather forecasting can be interpreted in terms of knowledge of longer-term phenomena of climate, for instance climatic cycles such as the El Niño–Southern Oscillation (ENSO), the Madden–Julian oscillation (MJO), the North Atlantic oscillation (NAO), the Arctic oscillation (AO), the Pacific decadal oscillation (PDO), and the Interdecadal Pacific Oscillation (IPO). Climate models are used for a variety of purposes from studying the dynamics of the weather and climate system to predictions of future climate.

Apeiron (/əˈpaɪˌrɒn/; ἄπειρον) is a Greek word meaning '(that which is) unlimited; boundless; infinite; indefinite' from ἀ- a- 'without' and πεῖραρ peirar 'end, limit; boundary', the Ionic Greek form of πέρας peras 'end, limit, boundary'.

The formula panta rhei (Ancient Greek: πάντα ῥεῖ, meaning "everything flows") is an aphorism which describes Heraclitus' doctrine. Plato attributes this teaching to Heraclitus in his dialogue Cratylus, but the formula first appears in the work of the late antique Neoplatonist Simplicius. This formulaic summary of Heraclitus' thought was already in use in Augustan times. Its Latin translation (cuncta fluunt) can be found in the 15th book of Metamorphoses in the "Speech of Pythagoras", in which Ovid sets out the natural philosophical foundation of his Metamorphoses.

Sappho (Ancient Greek: Σαπφώ Sapphṓ [sap.pʰɔ̌ː]; Aeolic Greek Ψάπφω Psápphō; c. 630 – c. 570 BC) was an Ancient Greek poet from Eresos or Mytilene on the island of Lesbos. Sappho is known for her lyric poetry, written to be sung while accompanied by music. In ancient times, Sappho was widely regarded as one of the greatest lyric poets and was given names such as the "Tenth Muse" and "The Poetess". Most of Sappho's poetry is now lost, and what is not has mostly survived in fragmentary form; only the Ode to Aphrodite is certainly complete. As well as lyric poetry, ancient commentators claimed that Sappho wrote elegiac and iambic poetry. Three epigrams formerly attributed to Sappho have survived, but these are actually Hellenistic imitations of Sappho's style.

Little is known of Sappho's life. She was from a wealthy family from Lesbos, though her parents' names are uncertain. Ancient sources say that she had three brothers: Charaxos, Larichos and Eurygios. Two of them, Charaxos and Larichos, are mentioned in the Brothers Poem discovered in 2014. She also appears to have had a daughter, traditionally identified with Cleïs, who is mentioned in two of Sappho's fragments, 98 and 132. Sappho was exiled to Sicily around 600 BC, and may have continued to work until around 570 BC. According to legend, she killed herself by leaping from the Leucadian cliffs due to her unrequited love for the ferryman Phaon.

Chronology (from Latin chronologia, from Ancient Greek χρόνος, chrónos, 'time'; and -λογία, -logia) is the science of arranging events in their order of occurrence in time, such as in a timeline or other sequence of events. It is also "the determination of the actual temporal sequence of past events".

Chronology is a part of periodization. It is also a part of the discipline of history including earth history, the earth sciences, and study of the geologic time scale.

A charter is the grant of authority or rights, stating that the granter formally recognizes the prerogative of the recipient to exercise the rights specified. It is implicit that the granter retains superiority (or sovereignty), and that the recipient admits a limited (or inferior) status within the relationship, and it is within that sense that charters were historically granted, and it is that sense which is retained in modern usage of the term. In early medieval Britain, charters transferred land from donors to recipients.

The word entered the English language from the Old French charte, via Latin charta, and ultimately from Greek χάρτης (khartes, meaning "layer of papyrus"). It has come to be synonymous with a document that sets out a grant of rights or privileges.

The Ezana Stone is an ancient stele still standing in modern-day Axum in Ethiopia, the centre of the ancient Kingdom of Aksum. This stone monument, that probably dates from the 4th century of the Christian era, documents the conversion of King Ezana to Christianity and his conquest of various neighbouring areas, including Meroë.

From AD 330 to 356, King Ezana ruled the ancient Kingdom of Aksum centred in the Horn of Africa. He fought against the Nubians, and commemorated his victories on stone tablets in praise of God. These liturgical epigraphs were written in various ancient languages, including the Ethiopian Semitic Geʽez, the South Arabian Sabaic, and Greek. The king's engravings in stone provided a trilingual monument in different languages, similar to the Rosetta Stone.

Prognosis (Greek: πρόγνωσις "fore-knowing, foreseeing"; pl.: prognoses) is a medical term for predicting the likelihood or expected development of a disease, including whether the signs and symptoms will improve or worsen (and how quickly) or remain stable over time; expectations of quality of life, such as the ability to carry out daily activities; the potential for complications and associated health issues; and the likelihood of survival (including life expectancy). A prognosis is made on the basis of the normal course of the diagnosed disease, the individual's physical and mental condition, the available treatments, and additional factors. A complete prognosis includes the expected duration, function, and description of the course of the disease, such as progressive decline, intermittent crisis, or sudden, unpredictable crisis.

When applied to large statistical populations, prognostic estimates can be very accurate: for example the statement "45% of patients with severe septic shock will die within 28 days" can be made with some confidence, because previous research found that this proportion of patients died. This statistical information does not apply to the prognosis for each individual patient, because patient-specific factors can substantially change the expected course of the disease: additional information is needed to determine whether a patient belongs to the 45% who will die, or to the 55% who survive.

Urology (from Greek οὖρον ouron "urine" and -λογία -logia "study of"), also known as genitourinary surgery, is the branch of medicine that focuses on surgical and medical diseases of the urinary system and the male reproductive organs. Organs under the domain of urology include the kidneys, adrenal glands, ureters, urinary bladder, urethra, and the male reproductive organs (testes, epididymides, vasa deferentia, seminal vesicles, prostate, and penis).

The urinary and reproductive tracts are closely linked, and disorders of one often affect the other. Thus a major spectrum of the conditions managed in urology exists under the domain of genitourinary disorders. Urology combines the management of medical (i.e., non-surgical) conditions, such as urinary-tract infections and benign prostatic hyperplasia, with the management of surgical conditions such as bladder or prostate cancer, kidney stones, congenital abnormalities, traumatic injury, and stress incontinence.

Ancient Greek mathematics refers to the history of mathematical ideas and texts in Ancient Greece during classical and late antiquity, mostly from the 5th century BC to the 6th century AD. Greek mathematicians lived in cities spread around the shores of the ancient Mediterranean, from Anatolia to Italy and North Africa, but were united by Greek culture and the Greek language. The development of mathematics as a theoretical discipline and the use of deductive reasoning in proofs is an important difference between Greek mathematics and those of preceding civilizations.

The early history of Greek mathematics is obscure, and traditional narratives of mathematical theorems found before the fifth century BC are regarded as later inventions. It is now generally accepted that treatises of deductive mathematics written in Greek began circulating around the mid-fifth century BC, but the earliest complete work on the subject is Euclid's Elements, written during the Hellenistic period. The works of renown mathematicians Archimedes and Apollonius, as well as of the astronomer Hipparchus, also belong to this period. In the Imperial Roman era, Ptolemy used trigonometry to determine the positions of stars in the sky, while Nicomachus and other ancient philosophers revived ancient number theory and harmonics. During late antiquity, Pappus of Alexandria wrote his Collection, summarizing the work of his predecessors, while Diophantus' Arithmetica dealt with the solution of arithmetic problems by way of pre-modern algebra. Later authors such as Theon of Alexandria, his daughter Hypatia, and Eutocius of Ascalon wrote commentaries on the authors making up the ancient Greek mathematical corpus.