Transit of the upper branch of the celestial meridian. Transit of the lower branch is called LOWER TRANSIT. Also called SUPERIOR TRANSIT, UPPER CULMINATION.


Related Terms

LASER TRANSIT

A transit in which a laser is mounted over the sighting telescope to project a clearly visible narrow beam onto a small target at the survey site.

IMPATT DIODE

A pn junction diode that has a depletion region adjacent to the junction, through which electrons and holes can drift, and is biased beyond the avalanche breakdown voltage. Derived from impact avalanche and transit time diode.

HORIZONTAL CIRCLE

A graduated disk affixed to the base of a transit or theodolite which is used to measure horizontal angles.

GREENWICH INTERVAL

An interval based on the moon's transit of the Greenwich celestial meridian, as distinguished from a local interval based on the moon's transit of the local celestial meridian.

HARBOR OF REFUGE

A place where ships in transit can find shelter from a storm. These are often man-made jetty enclosed areas along a featureless coastline where no nearby natural deep water harbors exist.

BEAR DOWN

Turn away from the wind, often with reference to a transit.

LIGHTS IN LINE

Two or more lights so situated that when observed in transit they define the alignment of a submarine cable, the limit of an area, an alignment for use in anchoring, etc. Not to be confused with RANGE LIGHTS which mark a direction to be followed.

WHARF

The place where ships tie up to unload and load cargo. A wharf typically has front and rear loading docks (aprons), a transit shed, open (unshedded) storage areas, truck bays, and rail tracks.

LOWER TRANSIT

Transit of the lower branch of the celestial meridian. Transit of the upper branch is called UPPER TRANSIT.

NAVY NAVIGATION SATELLITE SYSTEM

A satellite navigation system of the United States conceived and developed by the Applied Physics Laboratory of the Johns Hopkins University. It is an all-weather, worldwide, and passive system which provides two-dimensional positioning from low-altitude satellites in near-polar orbits. The Transit launch program ended in 1988, and the system is scheduled for termination in 1996, replaced by GPS.

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