The description and use of an universal and perpetual mathematical instrument ... shewing the most expeditious and exact method of solving all practical questions in arithmetick, trigonometry, navigation, dyalling, astronomy, &c. ... / by Benjamin Scott.

  • Scott, Benjamin, -1755.
Date:
1733
Catalogue details

Licence: Public Domain Mark

Credit: The description and use of an universal and perpetual mathematical instrument ... shewing the most expeditious and exact method of solving all practical questions in arithmetick, trigonometry, navigation, dyalling, astronomy, &c. ... / by Benjamin Scott. Source: Wellcome Collection.

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    [92] Example, What is the Number of Direction for the Year 1735? 7 The Dominical is B, which find on the left Hand, and inthe Bottom Line find the Epact 12, and tn the Place of meeting is 20, the Num- ber of Direction fought. By the Gregorian Number of Direction to find all the Foreign Feafts. Rule, Enter the Segment of the Circle in the Univerfal Inftrument with the Gregorian Num- ber of Direction for the Feaft requir’d, as you have been lately taught to do with the Fulian Number of Direction, fo fhall you obtain your Defire. Example, Septuagefima or the next Sunday but one betore Shrove Sunday is requir'd for the Year 1735? Number of Direction 20 given ; Firft I look for 20, the Gregorian Number of Direction, in the Segment of the Circle noted Sepruagefima ; and by applying one Leg of the Sector to cut the fame Number, do find in the the 12th Circle that the Hair of the faid Leg is upon the 6th Day of February, which is Septuagefima Sun- day ; and by the fame Method Shrove Sunday will be found to be the 20th Day of February, -and confequently Dres Cinerum, or Ah-Wed- nefday, the 23d, ditto; Pafcha, or Eafter, the roth of April ; Afcenfio, or Afcenfion-Day, the igth of May ; Pentecoft, or Whitfunday the 29th of May, €&c. A TABGSE