At modern speeds of aeroplane flight the Coriolis force, to which any moving body is subject on the rotating earth, produces a sensible displacement of the horizon as found by gravity. This note presents the necessary correction formulae and tables for astronomical altitudes taken in flight with the bubble sextant. This correction usually exceeds the atmospheric refraction, and in precise celestial ``avigation'' its application should become standard routine.

1.
e.g., W. J. Humphreys, Physics of the Air (1920), p. 134.
2.
For the various latitudes, values of g were taken from International Critical Tables, I, 401.
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© 1940 American Institute of Physics.
1940
American Institute of Physics
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