Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-12T10:35:32.187Z Has data issue: false hasContentIssue false

Timing and Data Acquisition System for a Field Astrolabe

Published online by Cambridge University Press:  04 August 2017

Carl F. Lukac
Affiliation:
U. S. Naval Observatory, Washington, D. C. 20390
Paul J. Wheeler
Affiliation:
U. S. Naval Observatory, Washington, D. C. 20390
Richard E. Keating
Affiliation:
U. S. Naval Observatory, Washington, D. C. 20390
Randolph T. Clarke
Affiliation:
U. S. Naval Observatory, Washington, D. C. 20390

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The Danjon Astrolabe at the Naval Observatory has been traditionally used to determine Universal Time and improve the systematic accuracy of star positions. During the past year, it has been used to determine latitude and longitude at remotely scattered sites for geodetic purposes. Operating this instrument away from the Observatory necessitated a mobile support and timing system rugged enough to operate dependably in ever changing, and sometimes harsh, environmental conditions.

This paper describes the performance of the astrolabe timing and data acquisition system, gives engineering design considerations, and describes the equipment and instrumentation.

Type
VI. Transit Circles and Astrolabes
Copyright
Copyright © Reidel 1986 

References

“HP 9915 Modular Computer”, May 1981, Pub. No. 5953-4550(40), Hewlett-Packard, Fort Collins, CO.Google Scholar
“HP9915 Installation Manual”, Oct. 1980, Pub. No. 09915-90000, Hewlett-Packard, Fort Collins, CO.Google Scholar
“HP85 Owner's Manual and Programming Guide”, Jan. 1981, Pub. No. 00085-90002 Rev. D, Hewlett-Packard, Corvallis, OR.Google Scholar
“I/O Programming Guide, Series 80”, Oct. 1981, Pub. No. 00085-90142 Rev. D, Hewlett-Packard, Corvallis, OR.Google Scholar
“HP-IB Installation and Theory of Operation Manual”, Oct. 1980, Pub. No. 82937-90007 Rev. B, Hewlett-Packard, Corvallis, OR.Google Scholar
“HP82939A Serial Interface Installation and Theory of Operation Manual”, Jun. 1981, Pub. No. 82939-90001 Rev. B, Hewlett-Packard, Corvallis, OR.Google Scholar
“Fairchild Model 4880 Instrument Coupler Instruction Manual”, Rev. 5, 1981, Fairchild Instruments, Los Angeles, CA. (Available for $25 from ICS Electronics, 1620 Banker Rd., Sandose, CA. 95112, Part No. 120002.) Google Scholar
Podobed, V.V., 1965, “Fundamental Astrometry”, (Eng. Ed. by Vyssotsky, A.N.), University of Chicago Press, Chicago, IL., pg. 107ff.Google Scholar
Lukac, C.F., Wheeler, P.J., Keating, R.E., Clarke, R.T., Dec. 1983, in “Proceedings of the Fifteenth Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting,” Washington, D.C. (in print).Google Scholar