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alidade

Overview page. Subjects: Archaeology — Astronomy and Astrophysics.

A simple sighting device for measuring altitudes. It consists of a bar pivoted so as to swing in a vertical plane and be aligned with a celestial object. The object's altitude can then be...

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Aries

Overview page. Subjects: Astronomy and Astrophysics — Literary Studies (Early and Medieval).

(Ari) (Arietis) A constellation of the zodiac, representing a ram. The Sun lies in Aries for the last 10 days of April until mid-May. Its brightest star is Alpha Arietis (Hamal). Gamma...

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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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aspect

Overview page. Subjects: Astronomy and Astrophysics — Literary Studies (Early and Medieval).

The position of a body in the Solar System relative to the Sun, as seen from Earth. The main aspects are conjunction, greatest elongation, opposition, and quadrature.

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astronaut

Overview page. Subjects: Astronomy and Astrophysics — Religion.

ˈæstrǝˌnôt

n. a person who is trained to travel in a spacecraft.

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The background

in Galileo

February 2001; p ublished online September 2013 .

Chapter. Subjects: Christianity; History of Science and Technology; Astronomy and Astrophysics. 4545 words.

‘The background’ gives an explanation of the prevailing scientific doctrine in the time of Galileo. Aristotelian philosophy was the basis of University education from the thirteenth...

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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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Callippus

Overview page. Subjects: Astronomy and Astrophysics — Classical Studies.

(c.370–c.300 bc)

Greek astronomer and mathematician. He modified Eudoxus' scheme of Earth-centred spheres, adding extra ones for the Sun, Moon, and some of the planets, bringing...

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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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catwalk

Overview page. Subjects: Arts and Humanities — Astronomy and Astrophysics.

Narrow footway, as on a bridge, or to give access to high-level parts of a building, e.g. sky-lights or gutters.

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