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Sextant altitude corrected for index error, height of eye, parallax, refraction, etc. Also called OBSERVED ALTITUDE, TRUE ALTITUDE.



Related Terms

POLARIS CORRECTION

A correction to be applied to the corrected sextant altitude of Polaris to obtain latitude. This correction for the offset of Polaris from the north celestial pole varies with the local hour angle of Aries, latitude, and date.

SEMIDIAMETER CORRECTION

A correction due to semidiameter, particularly that sextant altitude correction, when applied to the observation of the upper or lower limb of a celestial body, determines the altitude of the center of that body.

HEIGHT OF EYE CORRECTION

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

NOON CONSTANT

A predetermined value added to a meridian or ex-meridian sextant altitude to determine the latitude.

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.

PRECOMPUTED ALTITUDE

The altitude of a celestial body computed before observation, and with the sextant altitude corrections applied with reversed sign. When a precomputed altitude has been calculated, the altitude difference can be determined by comparison with the sextant altitude.

AUGMENTATION CORRECTION

A correction due to augmentation, particularly that sextant altitude correction due to the apparent increase in the semidiameter of a celestial body as its altitude increases.

APPARENT ALTITUDE

Sextant altitude corrected for inaccuracies in the reading (instrument, index, and persona

DIP CORRECTION

The correction to sextant altitude due to dip of the horizon. Also called HEIGHT OF EYE CORRECTION.

SEXTANT ALTITUDE

Altitude as indicated by a sextant or similar instrument, before corrections are applied.

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