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 329
thefe three being&nown. we may flnde the ai ks of the horizon between themeridian and the houre-circles N 1,2^.2, N$9&c. For* As the fine of 90 gr. is to the fine of the latitude tSo the tangent of the houre to the tangent of the houre line from the meridian. Extend the compaffes from the… … meridian.Thus the latitude being 51 gr. 30 m. I extendthe compares from the fine of 90^. to the fine of 51 gr. 30m, & find the fame extent to reach from the tangert of 3gr,^m. vnto the tangent of 2 gr, 56 m. for the diftanceof the firft quarter from the meridian; and from the tangentof J gr 30…
Astronomy · Puritans
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