Tycho, arguably the most accomplished astronomer of his time, appreciated the elegance of the Copernican system, but objected to the idea of a moving...

time). All house systems in Western astrology use twelve houses projected on the ecliptic. The differences arise from which fundamental plane is the object...

of the phases of Venus, craters on the Moon, and sunspots on the Sun. Astronomer Edmond Halley was able to successfully predict the return of Halley's...

fundamental (x, y) plane and primary (x-axis) direction, such as an axis of rotation. Each coordinate system is named after its choice of fundamental...

that a mathematical model of a heliocentric system was presented by the Renaissance mathematician, astronomer, and Catholic cleric, Nicolaus Copernicus...

Konstantin Batygin (Russian: Константи́н Юрьевич Батыгин) is an American astronomer and Professor of Planetary Sciences at Caltech. Konstantin Batygin was...

centuries BC, Babylonian astronomers developed a new empirical approach to astronomy. They began studying and recording their belief system and philosophies dealing...

from the fundamental function of providing astronomers with a reference frame to report their observations in, astrometry is also fundamental for fields...

Tor Books and published on July 16, 2019, as The Redemption of Time. Astronomer Ye Wenjie is brought to the military's top-secret Red Coast Project after...

Pérez is an astronomer and assistant professor at the University of Chile. She researches the formation and evolution of planetary systems to understand...

Paul Wild (German: [ˈvɪlt]; 5 October 1925 – 2 July 2014) was a Swiss astronomer and director of the Astronomical Institute of the University of Bern,...

International System of Units Latitude and longitude Orders of magnitude (time) "Non-SI units accepted for use with the SI, and units based on fundamental constants"...

that was in the past Latinized as Albategnius, (before 858 – 929) was an astronomer, astrologer, geographer and mathematician, who lived and worked for most...

major planets. With the discovery of Pluto in 1930, most astronomers considered the Solar System to have nine major planets, along with thousands of significantly...

Stephen Alexander (September 1, 1806 – June 25, 1883) was an American astronomer and educator. He was born in Schenectady, New York, on September 1, 1806...

Johnson, H. L.; Morgan, W. W. (1953). "Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas". The...

coordinates are given in degrees. Astronomers defined the fundamental location in the selenographic coordinate system by the small, bowl-shaped satellite...

Physics is the scientific study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy...

antique astronomy. Hipparchus is considered to be one of the greatest astronomers of ancient times, but most of his works are lost to history. The Farnese...

for Extraterrestrial Intelligence: A Fundamental Approach to the Basic Problem According to the Soviet astronomer, our civilization would be too young...

humanity to develop plans to escape the solar system rather than stay and fight. Luo Ji (罗辑) Astronomer and sociologist. Given the initial axioms of cosmic...

South African astronomer best known for discovering Proxima Centauri in 1915, and numerous binary stars. He was also the first astronomer to have seen...

example, is the Solar System normal or atypical? What is the origin of the stellar mass spectrum? That is, why do astronomers observe the same distribution...

James Cousins FRAS (8 August 1903 – 11 May 2001) was a South African astronomer. His career spanned 70 years during which time he concentrated on the...

A fundamental ephemeris of the Solar System is a model of the objects of the system in space, with all of their positions and motions accurately represented...

Johnson, H. L.; Morgan, W. W. (1953), Fundamental stellar photometry for standards of spectral type on the revised system of the Yerkes spectral atlas, The...

Harold Lester Johnson (April 17, 1921 – April 2, 1980) was an American astronomer. Harold Johnson was born in Denver, Colorado, on April 17, 1921. He received...

Heckmann (June 23, 1901 – May 13, 1983) was a German mathematician and astronomer, director of the Hamburg Observatory from 1941 to 1962, after which he...

Stanley Eddington (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician. He was also a philosopher of science and...

primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical...