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prime meridian

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

A fixed circle of longitude on the surface of a body, used as a reference from which other longitudes can be measured west or east. The prime meridian on Earth passes through the transit...

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semidiameter

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

The apparent equatorial radius of a celestial body, such as the Sun, Moon, or a planet, expressed as an angle.

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zone time

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

The civil time that is kept within one of the 24 time zones into which the Earth's surface is divided. It differs from Universal Time by a whole number of hours, being ahead of UT in time...

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