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Al-Farghani writes Elements of Astronomy
Al-Farghani described celestial motions in a work later influential in European astronomy.
Al-Sufi writes the Book of Fixed Stars
Al-Sufi combined Ptolemaic constellation mapping with Arabic astronomical traditions and observations.
Supernova SN 1006 observed
Observers in several regions recorded the exceptionally bright stellar event now designated SN 1006.
Crab supernova recorded
East Asian astronomers recorded the guest star associated with the Crab Nebula.
Halley’s Comet commemorated in the Bayeux Tapestry
The Bayeux Tapestry depicts the comet’s appearance around the Norman conquest.
Wolf Minimum of solar activity
Tree-ring evidence indicates a prolonged interval of reduced solar activity.
Korean astronomers record a nova
Korean observers recorded a guest star that faded after roughly two weeks.
Copernicus publishes his heliocentric model
De revolutionibus orbium coelestium presented a mathematical planetary model centered on the Sun.
Tycho Brahe observes a new star
Tycho Brahe and East Asian observers recorded the supernova now designated SN 1572.
Mira’s variability discovered
David Fabricius recognized changes in the brightness of the star later named Mira.
Kepler’s supernova observed
European and East Asian observers recorded the supernova now designated SN 1604.
Early telescope developed in the Netherlands
Dutch lensmakers developed the telescope, opening a new route to astronomical observation.
Kepler publishes his first two planetary laws
Kepler described elliptical planetary orbits and the equal-area law using Tycho Brahe’s observations.
Galileo begins observations of Jupiter’s moons
Category: Discoveries and Scientific Results, type: Discovery
Galileo observed points of light near Jupiter that subsequent observations established as orbiting moons.
Kepler suggests a solar influence on comet tails
In a letter to Galileo, Kepler proposed that a solar breeze pushes comet tails away from the Sun.
Galileo publishes Letters on Sunspots
Galileo argued that sunspots are features of the Sun rather than bodies passing in front of it.
Kepler’s third planetary law published
Kepler related a planet’s orbital period to the size of its orbit.
Maunder Minimum
Solar observations show an extended period with unusually few sunspots.
Newton publishes the Principia
Newton’s Principia presented laws of motion and universal gravitation.
Halley predicts a comet’s return
Edmond Halley linked earlier comet apparitions and predicted a future return of the same object.