transit instrument

He invented the transit instrument.

Observation of meridian transits was once very important for timekeeping purposes (see transit instrument).

In 1860-61 he mounted a transit instrument, constructed a chronograph, and made the first accurate determination of the latitude of the college observatory.

In astronomy, transit instruments are used for the precise observation of star positions.

He invented the combined transit instrument and zenith telescope that was used to determine latitude, including that of Hawaii.

The NRT is a transit instrument of the unusual Kraus-type design, with two mirrors.

Ptolemy claims his solar observations were on a transit instrument set in the meridian.

For instance, a surveyor's theodolite can function as a transit instrument if its telescope is capable of a full revolution about the horizontal axis.

These methods were very inconvenient and in 1690 Ole Rømer invented the transit instrument.

The only telescope in the establishment when he took charge was the transit instrument, and to this he vigorously devoted himself.