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focal point

Overview page. Subjects: Psychology — Astronomy and Astrophysics.

The point at which parallel light rays passing through a lens or reflected from a curved mirror converge, or the point from which they appear to diverge after refraction or reflection by...

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pupil

Overview page. Subjects: Psychology — Astronomy and Astrophysics.

The dark central opening in the iris through which light enters the eye, its variable diameter being controlled by the dilator pupillae and sphincter pupillae muscles of the iris. See also...

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syzygy

Overview page. Subjects: Psychology — Astronomy and Astrophysics.

The situation that occurs when the sun, the moon (or a planet), and the earth are in a straight line. This occurs when the moon (or planet) is at conjunction or opposition.

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zenith distance

Overview page. Subjects: Psychology — Astronomy and Astrophysics.

(z)

The angular distance of a celestial body from the zenith. The zenith distance is 90 ° minus the body's altitude above the horizon (i.e. the complement of the altitude) and...

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