To observe the altitude of (a celestial body).


Related Terms

MAXIMUM ORDINATE

Difference in altitude between the origin and highest point of the trajectory of a projectile.

AIR LOCK

A chamber capable of being hermetically sealed that provides for passage between two places of different pressure, such as between an altitude chamber and the outside.
On gas carriers used to maintain the pressure difference between the explosion-proof area and the cargo deck.

HORIZON SYSTEM OF COORDINATES

A set of celestial coordinates based on the celestial horizon as the primary great circle; usually altitude and azimuth or azimuth angle.

HORIZONTAL PARALLAX

The geocentric parallax when a body is on the horizon. The expression is usually used only in connection with the moon, for which the tabulated horizontal parallax is given for an observer on the equator. The parallax at any altitude is called PARALLAX IN ALTITUDE.

HEIGHT OF EYE CORRECTION

The correction to sextant altitude due to dip of the horizon. Also called DIP CORRECTION

HYPSOMETRIC TINTING

A method of showing relief on maps and charts by coloring, in different shades, those parts which lie between different levels. Also called ALTITUDE TINTS, COLOR GRADIENTS, ELEVATION TINTS, GRADIENT TINTS, LAYER TINTS.

IRRADIATION CORRECTION

A correction due to irradiation, particularly that sextant altitude correction caused by the apparent enlargement of the bright surface of a celestial body against the darker background of the sky.

INVERSION

In meteorology, a departure from the usual decrease or increase with altitude of the value of an atmospheric property. This term is almost always used to refer to a temperature inversion, an atmospheric condition in which the temperature increases with increasing altitude.

LIMB

1. The graduated curved part of an instrument for measuring angles, such as the part of a marine sextant carrying the altitude scale, or ARC. 2. The circular outer edge of a celestial body, usually referred to with the designation upper or lower

ALTITUDE AZIMUTH

An azimuth determined by solution of the naviga- tional triangle with altitude, declination, and latitude given. A time azimuth is computed with meridian angle, declination, and latitude given. A time and altitude azimuth is computed with meridian angle, declination, and altitude given

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