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 295
lcribe an arkof a circle S B N. The lame femidia neter will Jet or 60gr,from B unto S for the South end,and other 6ojp\from B vn-to 2{Jor the North end of rhe Bow: fothe whole Bow willcontainei2oj>*. the third part of a circle. Let it therefore bediuided into 10 many degrees, and each degre… … The Bow being thus diuided and numbred, you may kt the Tht defcriffton of the Bow. io1 the moftehs and dayes of each rnoneth upon the backe, andfuch ftarres as are fit for obfcruation vpon the fide of tbeBow. If vou defire to make vfe of it in North latitude, you maynumber 23 gr. 90 w. from 90…
Astronomy · Puritans
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