The description and use of the sector, crosse-staffe, and other instruments : with a canon of artificiall Sines and Tangents, and the use thereof in astronomie, navigation, dialling and fortification .. (1636)
Gunter, Edmund, 1581-1626 · London : Printed by William Iones for Iames Bowler · leaf 363
of the plane falling on the houre of 8 io the mor-ning, there will be foure houres on the one fide, and fiuc on the 16 S Tbe defer iptiM eft he heure-lints the other fide of the fubftylar. But in all polar plane* theheight oftheftyleaboue the fubftylar muftbe equal! to thediftance of the third… … 4 Becaufe the equator A C is a tangent line in refpeftof the Radius *B C,and the parts thereof arc fuch as belongto the angles betweene the meridian of the plane and thehoure-lines, which angles are fet downc in the table follow* J jing, I may fmdethc length of each feaerall tangent in this Jl…
Astronomy · Puritans
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