Je was op zoek naar: trigonometry (Engels - Xhosa)

trigonometry functions
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interpolation was necessary but the point to emphasise here is that the navigator had by now all but rid himself of trigonometry and logarithms.
ubhalo ncwadini lwaluyimfuneko kodwa eyona nto ifuna ukugxininiswa apha kukuba umqhubi sikhephe wayesele eyilahlile itrigonometrikhi nelogarithimu.

given the latitude and solar declination, the true bearing of the point on the horizon at which the sun rises and sets is readily calculated by spherical trigonometry.
ukunikwa kwemimandla metyekelo lwelanga, ukuziphatha okuyinyani kwincam ethe tyaba apho ilanga liphuma ze lihlale lilindele ukubalwa mgenzululwazi olungqukuva.