A crystal-controlled observatory clock

Details A crystal-controlled observatory clock A crystal-controlled observatory clock

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..731l&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Oct.-Nov. 1979, p. 731-736.

Astronomy and Astrophysics

Astronomy

1

Clocks, Time Signals, Astronomical Observatories, Automation, Data Systems, Photometers, Sidereal Time

Scientific paper

A project designed to develop an automated photometer at Michigan State University began a number of years ago. Since the computer-controlled photometer would record fully documented observations of variable stars automatically on magnetic tape, there was an apparent need for a computer-readable digital clock. The paper describes the details of such a clock, which is an inexpensive crystal-controlled clock capable of producing both civil and sidereal time. The computer-readable outputs provide UTC and EST to 0.001 sec, the corresponding dates, and local sidereal time to 0.1 sec. A major feature is that the UTC clock can be phased to WWV without stopping the clock. The sidereal clock can be preset and precisely started by an internal clock-generated pulse. The clock drives display units located at convenient observatory sites. A block diagram of clocks and calendars is included.

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