SETI@home ("SETI at home") is a project of the Berkeley SETI Research Center to analyze radio signals, searching for signs of extraterrestrial intelligence.Until March 2020, it was run as an Internet-based public volunteer computing project that employed the BOINC software platform. It is hosted by the Space Sciences Laboratory at the University of California, Berkeley, and is …

Astrology and astronomy were archaically treated together (Latin: astrologia), but gradually distinguished through the Late Middle Ages into the Age of Reason.Developments in 17th century philosophy resulted in astrology and astronomy operating as independent pursuits by the 18th century.. Whereas the academic discipline of astronomy studies observable phenomena …

A lunar eclipse can occur only when the full Moon is near either lunar node (within 11° 38' ecliptic longitude), while a solar eclipse can occur only when the new Moon is near either lunar node (within 17° 25').. Both solar eclipses of July 2000 (on the 1st and 31st days) occurred around the time when the Moon was at its ascending node. Ascending-node eclipses recur after one …

The Jantar Mantar, Jaipur is a collection of 19 astronomical instruments built by the Rajput king Sawai Jai Singh II, the founder of Jaipur, Rajasthan.The monument was completed in 1734. It features the world's largest stone sundial, and is a UNESCO World Heritage site. It is near City Palace and Hawa Mahal. The instruments allow the observation of astronomical positions with …

Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. 60 km/h northbound).Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.. Velocity is a physical …

A gravitational singularity, spacetime singularity or simply singularity is a condition in which gravity is so intense that spacetime itself breaks down catastrophically. As such, a singularity is by definition no longer part of the regular spacetime and cannot be determined by "where" or "when". Gravitational singularities exist at a junction between general relativity and quantum mechanics ...

In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location. Consequently, it contains also the north and south points on the horizon, and it is perpendicular to the celestial equator and horizon. Meridians, celestial and geographical, are determined by the pencil of planes passing through the Earth's …

The Sky at Night is a monthly documentary television programme on astronomy produced by the BBC.The show had the same permanent presenter, Sir Patrick Moore, from its first broadcast on 24 April 1957 until 7 January 2013.The latter date was a posthumous broadcast, following Moore's death on 9 December 2012. This made it the longest-running programme with the …

Sunset, also known as sundown, is the daily disappearance of the Sun below the horizon due to Earth's rotation.As viewed from everywhere on Earth (except the North and South poles), the equinox Sun sets due west at the moment of both the spring and autumn equinoxes. As viewed from the Northern Hemisphere, the Sun sets to the northwest (or not at all) in the spring and …

Cosmic voids (also known as dark space) are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies.The cosmological evolution of the void regions differs drastically from the evolution of the Universe as a whole: there is a long stage when the curvature term dominates, which prevents the formation of galaxy clusters and …

Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline said, Astrophysics "seeks to ascertain the nature of the heavenly bodies, rather than their positions or motions in space–what they are, rather than where they are." Among the subjects studied are …

The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.This plane of reference bases the equatorial coordinate system.In other words, the celestial equator is an abstract projection of the terrestrial equator into outer space. Due to Earth's axial tilt, the celestial equator is currently inclined by about 23.44° with respect …

Navagraha are nine heavenly bodies and deities that influence human life on Earth according to Hinduism and Hindu astrology. The term is derived from nava (Sanskrit: नव "nine") and graha (Sanskrit: ग्रह "planet, seizing, laying hold of, holding"). Note that the Earth, Uranus, Neptune and Pluto are excluded from the Navagraha,.However, the Sun is part of the Navagraha.

Sofia (/ ˈ s oʊ f i ə, ˈ s ɒ f-, s oʊ ˈ f iː ə / SOH-fee-ə, SOF-; Bulgarian: София, romanized: Sofiya, IPA: ()) is the capital and largest city of Bulgaria.It is situated in the Sofia Valley at the foot of the Vitosha mountain in the western parts of the country. The city is built west of the Iskar river, and has many mineral springs, such as the Sofia Central Mineral Baths.