A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around 20 March and 23 September.. More precisely, an equinox is traditionally defined as the …

Vikram Samvat (IAST: Vikrama Samvat; abbreviated VS) or Bikram Sambat B.S. and also known as the Vikrami calendar, is a national calendar of Nepal historically used in the Indian subcontinent.Vikram Samvat is generally 57 years ahead of Gregorian Calendar, except during January to April, when it is ahead by 56 years. Alongside Nepal Sambat, it is one of the two …

The second millennium of the Anno Domini or Common Era was a millennium spanning the years 1001 to 2000 (11th to 20th centuries; in astronomy: JD 2 086 667.5 – 2 451 909.5).. It encompassed the High and Late Middle Ages of the Old World, the Islamic Golden Age and the period of Renaissance, followed by the Early Modern period, characterized by the Wars of …

September is the ninth month of the year in both the Julian and Gregorian calendars, the third of four months to have a length of 30 days, and the fourth of five months to have a length of fewer than 31 days.September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent.. In the Northern hemisphere, the beginning of the meteorological …

Between the 1st and 3rd centuries AD, the Roman Empire gradually replaced the eight-day Roman nundinal cycle with the seven-day week. The earliest evidence for this new system is a Pompeiian graffito referring to 6 February (ante diem viii idus Februarias) of the year AD 60 as dies solis ("Sunday").Another early witness is a reference to a lost treatise by Plutarch, written …

This corresponds to a relative standard uncertainty of 2.2 × 10 −5 (22 ppm).. Natural units. The gravitational constant is a defining constant in some systems of natural units, particularly geometrized unit systems, such as Planck units and Stoney units.When expressed in terms of such units, the value of the gravitational constant will generally have a numeric value of 1 or …

Concerning the lunar month of ~29.53 days as viewed from Earth, the lunar phase or Moon phase is the shape of the Moon's directly sunlit portion, which can be expressed quantitatively using areas or angles, or described qualitatively using the terminology of the 4 major phases: new moon, first quarter, full moon, last quarter and 4 minor phases: waxing crescent, waxing …

In Indian philosophy, Maharishi Kanada was the first to systematically develop a theory of atomism around 200 BCE though some authors have allotted him an earlier era in the 6th century BCE. It was further elaborated by the Buddhist atomists Dharmakirti and Dignāga during the 1st millennium CE. Pakudha Kaccayana, a 6th-century BCE Indian philosopher and contemporary …

The center of the Universe is a concept that lacks a coherent definition in modern astronomy; according to standard cosmological theories on the shape of the universe, it has no center.. Historically, different people have suggested various locations as the center of the Universe. Many mythological cosmologies included an axis mundi, the central axis of a flat Earth that …

Flat Earth map drawn by Orlando Ferguson in 1893. The map contains several references to biblical passages as well as various jabs at the "Globe Theory". The flat Earth model is an archaic and scientifically disproven conception of Earth's shape as a plane or disk. Many ancient cultures subscribed to a flat Earth cosmography, including Greece until the classical period …

The decans (/ ˈ d ɛ k ən z /; Egyptian bꜣktw or baktiu, "[those] connected with work") are 36 groups of stars (small constellations) used in the ancient Egyptian astronomy to conveniently divide the 360 degree ecliptic into 36 parts of 10 degrees each, both for theurgical and heliacal horological purposes. The decans each appeared, geocentrically, to rise consecutively on the …

Early life. Brisbane was born at Brisbane House in Noddsdale, near Largs in Ayrshire, Scotland, the son of Sir Thomas Brisbane and his wife Eleanora (née Bruce).He was educated in astronomy and mathematics at the University of Edinburgh.He joined the British Army's 38th (1st Staffordshire) Regiment of Foot in 1789 and had a distinguished career in Flanders, the West …