Medieval Renaissance

Dark Ages

A period when knowledge of Ancient Greeks became inaccessible due to the merger of church and state, leading to a decline in science.

The Almagest

Ptolemy’s astronomy textbook that was translated from Arabic to Latin, meaning 'The Greatest'.

Alpha Centauri

A star system; 'Alpha' denotes it as the brightest star.

Arabic Star Names

The names of bright stars are typically Arabic in origin due to the Golden Age of Islam's focus on astronomy and mythology.

Regiomontanus

A scholar whose translation of The Almagest from Greek to Latin included important commentaries for understanding the Ptolemaic system.

Geocentric Cosmology

The cosmological model adopted by the medieval Church that positioned the Earth at the center of the universe.

Retrograde Motion

An apparent backward motion of planets as observed from Earth, resulting from the relative positions of the planets.

De Revolutionibus

Copernicus' famous book presenting his heliocentric model, short for De Revolutionibus Orbium Coelestium.

Supernova

An astronomical event involving a massive star dying in an explosion, observed by Tycho Brahe in 1572.

Parallax

The apparent shift of an object relative to its background due to a change in the observer's position.

Astronomical Unit

The average distance from the Earth to the Sun, approximately 150 million kilometers.

Tychonic System

A geocentric model where Earth is at the center, with the Sun, Moon, and stars orbiting it, while planets orbit the Sun.

Tycho's Star

The supernova observed by Tycho Brahe that contradicted the belief that celestial bodies were fixed.

Celestial Realm

The belief that certain phenomena, like comets, belong to the heavens, challenging the idea of fixed celestial spheres.