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 376
fe the length of the ftyle aboue the plane to bee 10inches, and chat it were required to findc the femidiameterof the tropique, whole declination is knowneto be 23 gr. 30»»: extend the compaffes from the tangent of45 ifr, vnto thetangent ot 66 gr. ^o m. the fame extent will reach in the lineof… … gr. then 37- 32 \\iiogr. then $6. 71 jif5.jp-.then 114*305.and fo in the re ft. Or ifit were required ro proportion the ftyle to the planea As the tangent of 4 % gr. to thetangenr of the declination :Sothefemidiameterofthe planer to the length of the ftylc. As if the femidiameter of the greateft…
Astronomy · Puritans
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