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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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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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celestial sphere

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

The imaginary sphere, centred on the observer, on which all celestial bodies such as the Sun, Moon, and stars appear to be located. The positions of certain atmospheric optical phenomena...

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equant

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

In the Ptolemaic system of planetary motion, a point to one side of the Earth with respect to which an epicycle would have uniform angular motion.

equant

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parking orbit

Overview page. Subjects: Literature — Astronomy and Astrophysics.

The orbit used by a spacecraft as a waiting position between two phases, for example before it begins a new trajectory. A space shuttle might go into a parking orbit, circling the globe in...

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singularity

Overview page. Subjects: Astronomy and Astrophysics — Literature.

A mathematical point at which certain physical quantities reach infinite values. For example, according to general relativity, the curvature of spacetime becomes infinite in a black hole....

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space helmet

Overview page. Subjects: Astronomy and Astrophysics — Literature.

The protective headgear worn by astronauts, especially for extravehicular activities (EVAs).

Helmets are so critical that the Mercury helmets accounted for half of the spacesuit...

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terraforming

Overview page. Subjects: Literature — Astronomy and Astrophysics.

The hypothetical idea of creating an Earthlike environment on another planet. Some scientists believe that astronauts could create an oxygenated atmosphere that would make Mars and other...

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