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

Related Terms

PLANE CORRECTION

A correction applied to observed surveying data to reduce them to a common reference plane.

PEEL-OFF TIME

In seismic prospecting, the time correction applied to observed data to adjust them to a depressed reference datum.

ORTHOMETRIC CORRECTION

A systematic correction that must be applied to a measured difference in elevation since level surfaces at varying elevations are not absolutely parallel.

INDEX CORRECTION

The correction due to index error

INSTRUMENT CORRECTION

That correction due to instrument error

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.

IONOSPHERIC CORRECTION

A correction for ionospheric refraction, a major potential source of error in all satellite radionavigation systems. Navigation errors can result from the effect of refraction on the measuremen

AIR TEMPERATURE CORRECTION

A correction due to nonstandard air temperature, particularly the sextant altitude correction due to changes in refraction caused by difference between the actual temperature and the standard temperature used in the computation of the refraction table. The Nautical Almanac refraction table is based upo

NOCTURNAL

An old navigation instrument which consisted of two arms pivoted at the enter of a disk graduated for date, time and arc. The nocturnal was used for determining time during the night and for obtaining a correction to be applied to an altitude observation of Polaris for finding latitude.

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.

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