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An Improved Astrograph

Published online by Cambridge University Press:  18 January 2010

D. H. Sadler
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Extract

Although the Astrograph has never been formally described in print, the basic principles of the instrument are sufficiently well known to require no further elaboration; so also are its limitations. Over many years, numerous proposals (but mainly unpublished) have been made for the extension of the Astrograph to cater for the Sun, Moon, and planets, as well as for a larger number of stars, but none have been really satisfactory. Without such improvements the Astrograph must have a very limited use, and accordingly a further study was made some time ago of its application to the Sun, Moon, and planets. Methods were developed on familiar lines for shifting (and rotating) the star curves for a standard declination to cater for neighbouring declinations, but these introduced complexities that were clearly unacceptable.

Type
Research Article
Information
The Journal of Navigation , Volume 6 , Issue 4 , October 1953 , pp. 373 - 379
Copyright
Copyright © The Royal Institute of Navigation 1953

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References

REFERENCES

1Herrick, S. (1946). Instrumental solution in celestial navigation. Navigation, Los Angeles, I, 22.Google Scholar
2Michell, R. B. (1953). Navigation at sea with a star lattice. This Journal, 6, 63.Google Scholar
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4 See, for instance, the current Air Almanac, p. A48.Google Scholar