COMPUTATION OF LOXODROME AND ORTHODROME LENGTHS FOR EXTENDED NAVIGATION ROUTES TAKING INTO ACCOUNT THE ELLIPTICAL SHAPE OF THE EARTH

  • V. M. Speshilov Kherson State Maritime Institute
Keywords: orthodromy, calculation of the length of locsodromy and orthodromy, routes of sailing, earth spheroidicity

Abstract

Calculation of the length of orthodromy by means of formulas of spherical trigonometry using Tables of natural values of trigonometric functions is associated with certain difficulties if orthodromy crosses terrestrial equator or difference of longitudes of initial and final points of orthodromy exceeds 900. In this case a need arises to convert formulas taking into account a rule of signs. Under conditions on board a ship for mathematical calculations it is expedient to apply simplified (applied) mathematical formulas that are not, approximated, but more convenient to be applied with a purpose of decreasing a probability of errors associated with application of the “rule of signs” while solving trigonometric equations.

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Published
2010-07-02