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History x Astronomy and Astrophysics x clear all

armillary sphere

Overview page. Subjects: History — Astronomy and Astrophysics.

An instrument used since ancient times to demonstrate and observe the movements of the heavens. It consists of a number of rings (armillaries) representing celestial great circles such as...

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balloon

Overview page. Subjects: Military History — Astronomy and Astrophysics.

Bǝˈlōōn

n.a large bag filled with hot air or gas to make it rise in the air, typically carrying a basket for passengers: a hot-air balloon.

when or before the ...

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Caroline Lucretia Herschel

Overview page. Subjects: History — Astronomy and Astrophysics.

(1750–1848) German–British astronomer. See Herschel, Sir (Frederick) William.

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Christoph Scheiner

Overview page. Subjects: Astronomy and Astrophysics — Early Modern History (1500 to 1700).

(1573–1650)

Germanscholar and astronomer. In 1611, with the aid of a telescope he built himself, he became one of several independent discoverers of sunspots (the others included...

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epact

Overview page. Subjects: Astronomy and Astrophysics — Medieval and Renaissance History (500 to 1500).

A term used in ecclesiastical lunar tables to calculate the date of Easter. It gives the age of the Moon (i.e. the number of days since New Moon) at the start of each year.

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Julian calendar

Overview page. Subjects: Astronomy and Astrophysics — History.

The form of calendar first introduced in 46 bc by the Roman emperor Julius Caesar, after whom it is named. It was prepared in consultation with the Greek astronomer Sosigenes (1st century...

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Mae Carol Jemison

Overview page. Subjects: United States History — Astronomy and Astrophysics.

(1956– )

US astronaut and physician. She made history as the first black woman in space, on the first Japanese Spacelab mission, aboard the space shuttle Endeavour in September...

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Neil Armstrong

Overview page. Subjects: Astronomy and Astrophysics — History.

(b. 1930),

American astronaut. Neil Alden Armstrong became the first man to set foot on the Moon on July 20, 1969. Armstrong, a veteran test pilot, engineer, and astronaut,...

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old style

Overview page. Subjects: Astronomy and Astrophysics — History.

The dating of days and months before the replacement of the Julian by the Gregorian calendar in 1752 and the change from 25 March to 1 January as the official start of a new year.

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Pleiades

Overview page. Subjects: Early Modern History (1500 to 1700) — Astronomy and Astrophysics.

A prominent open cluster in Taurus, popularly termed the Seven Sisters, and also known as M45. The cluster spans over 1½° of sky and contains about 100 stars, the brightest of which is...

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