Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood].

  • Norwood, Richard, 1590?-1675.
Date:
1661
Catalogue details

Licence: Public Domain Mark

Credit: Trigonometrie. Or, the doctrine of triangles: divided into two books. The first shewing the mensuration of right lined triangles: the second of spherical ... Both performed by that late and excellent invention of logarithms ... Whereunto is annexed (chiefly for the use of sea-men) a treatise of the application thereof in the three principal kinds of sailing. With exact tables of the suns declination ... and tables of the right ascension and declination of some eminent fixed stars ... Also other necessary tables used in navigation / [Richard Norwood]. Source: Wellcome Collection.

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    ythe Pofifcrépt. T99 months, the Sun enters into’one’ of ‘thefe fignes: Asin Afarch in- toV, or erie; ‘In eApril into S, thavis Taerm'; In Aday into mt, thatis Gemini; ‘and fo the:reft fuccefliyely. “But now to know fer twelve words, each anfwering to his morith:-andfigne, .as.before you may fee; each ef thefe twelve words begin witha vowel, exceps che laft for February, which begins with an s, and fignifies 8, and fo denotes, that upon the 8 day of: Febrwary the Sun enters into Ps/ces, The yowels at beginning of every other word ftand! for numbers, as A fort &tor2./ fot 20 wr4sy iorsek tt aE “New, if in any month you would know what day the Surrenters the fiene for that month, put thé siumber, of that vowel to 8, and fo into SL,that is Leo,I find the word an{wering to that month is[ order | whofe vowel @ fignifies 4, which put to 8 makes 12 ; cherefore,] fay, upon the 12 of Ja#/ytheSun entereth into Leo: And fo for any other maonth aecording to this Table. | (March 10|¥ dries | Now knowing on what---day---of-...the. April 91% Taurus (may 10| IL Gemini month the Sun enters py me June 11% (aucer any figne, it will be Thus'we fhall | JZ, 12/9, Leo eafie to know forany find the Suns; “Auguft 12\np Vargo other day of that entrafice into | September 12 at month the degree the Sun isin: Sub{trad the day of the Suns entrance inte the refpective| Oétober 1 3\m Scorpio fignestobe | November 11:7 S agitary December 11 \yp Capricorn anwar Oley Aquarius | Je ivage : ae Pifces Ane the month, | eit, Ma as Mb a a e day propo- fed (adding to it 30, if itbe too little) the remainer isthe degree wherein the Sun is, which if you borrowed 30, isthe degree of the figne preceding; otherwife it is the degree of the figne of the month propoled,. ‘ , * SS EEE aR ns Example