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Distance Off by Vertical Sextant Angle

Published online by Cambridge University Press:  18 January 2010

A. N. Black
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The note by J. W. Crosbie prompts the writer to the following comments. Lecky's Tables2 do not cover vertical angles below the geometrical horizon (zenith distance =90°), or, indeed, angles of less than 10’ above it. Crosbie's method, also, does not cater for angles below the geometrical horizon, though it could be adapted to do so. His extraordinary evolutions with the traverse tables, undertaken to avoid solving a quadratic equation by orthodox methods, are fascinating. Surely, a slide rule, with which the equation could be solved in a few seconds, is available in today's chartroom.

Type
Forum
Information
The Journal of Navigation , Volume 23 , Issue 4 , October 1970 , pp. 522 - 523
Copyright
Copyright © The Royal Institute of Navigation 1970

References

REFERENCES

1Crosbie, J. W. (1970). Distance off by vertical sextant angle. This Journal, 23, 253.Google Scholar
2Lecky, S. T. S.The Danger Angle, and Off-shore Distance Tables, 21st Edition, 1918.Google Scholar