Elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J · New York: J. Wiley & sons · leaf 65
the amount by which it is decreased being about ^thof the whole. 59. Application of Dip.—Tables have been computed inwhich may be found the proper dip for different heights abovethe surface of the earth. Dip constitutes one of the correc-tions which are to be applied at sea to the observed altitude… … Fig. 23.* * The curved line HD is tangent to the earths surface at K MEASUREMENT OF THE EARTH. 59 CHAPTEE IV. THE EARTH. ITS SIZE, FORM, AND ROTATION. 60. Having seen what are the construction and the adjustmentsof the principal astronomical instruments, to what uses each isadapted, and what…
Astronomy
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