Books Books The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds. A Treatise of Plane and Spherical Trigonometry: In Theory and Practice ... - Page ix
by Francis Nichols - 1811 - 128 pages ## The Description and Use of the Globes, and the Orrery: To which is Prefixed ...

Joseph Harris - Astronomical models - 1732 - 258 pages
...Pole is placed, and the opppfite one is the Southern Hemifphere. The Aftronomers divide all Circles into 360 equal Parts called 'Degrees, each Degree...into 60 equal Parts called Minutes, each Minute into 60 Seconds, &c. But befides this Divifion into Degrees, the Equir noftial is commonly divided into... ## An essay on mechanical geometry, explanatory of a set of models

Benjamin Donne - 1796 - 118 pages
...calculating the proportion which angles bear to each other, fuppofe the circumference of every circle to be divided into 360 equal parts, called Degrees ;...60 equal parts, called minutes ; each minute into 60 equal parts named feconds, &c. Ar. B. Sometimes the circumference of a circle is called a circle;... ## A Complete System of Practical Arithmetic, with Various Branches in the ...

William Taylor (teacher of the mathematics.) - Arithmetic - 1800 - 519 pages
...a' femi-eircle • half the diameter is called the Radius. 8. The circumference of every circle is divided into 360 equal parts called Degrees ; each degree into 60 equal parts, called Minutes ; and each minute into 60 equal parts, called Seconds, &c. Any part of the the circumference is called... ## A Summary of Geography and History, Both Ancient and Modern ...: With an ...

Alexander Adam - Classical dictionaries - 1802 - 914 pages
...of the fame circle are always equal to one another. The circumference of every circle is fuppofed to be divided into 360 equal parts, called degrees ; each degree into 60 mi* ñutes \ each minute into 60 feccnds ; and thefe into thirds, fourths, &c. greater or ¡efs according... ## A Treatise on Plane and Spherical Trigonometry: With Their Most Useful ...

John Bonnycastle - Trigonometry - 1806 - 464 pages
...contained between its two legs, and having the angular point for its centre. Every circle is supposed to be divided into 360 equal parts, called degrees ;...60 equal parts, called minutes ; each minute into 60 equal parts, called seconds ; &c. So that a semicircle, or half the circumference, contains 1 80... ## Elements of Natural Philosophy: Arranged Under the Following Heads: Matter ...

Astronomy - 1808 - 272 pages
...Ecliptic. This circle we suppose to be divided into 12 equal parts, called Signs ; each sign . into 30 equal parts, called Degrees ; each degree into 60 equal parts called Minutes ; and every minute into 60 equal parts, called Seconds; so that a second is the 60th part of a minute... ## Astronomy Explained Upon Sir Isaac Newton's Principles: And Made Easy to ...

James Ferguson - Astronomy - 1809 - 533 pages
...ecliptic. tic. This circle we suppose to be divided into 12 equal parts, called signs ; each sign into 30 equal parts, called degrees; each degree into 60 equal parts, called minutes; and each minute into 60 into 60 equal parts, called seconds : so that a second Plate I. is the 60th... ## An Introduction to the Theory and Practice of Plane and Spherical ...

Thomas Keith - Navigation - 1810 - 482 pages
...and the arc DE is the measure of the angle ABC. (H) The circumference of every circle is supposed to be divided into 360 equal parts called degrees, each...into 60 equal parts called minutes, each minute into 60 equal parts called seconds. The angles are measured by the number of "egrees cut from the circle... ## A New Treatise on the Use of the Globes, Or, A Philosophical View of the ...

Thomas Keith - Astronomy - 1811 - 386 pages
...year 1804, was 13° 14' 43" and its declination 80° "15' 44" north. \$ Every circle is supposed to be divided into 360 equal parts, called degrees ;...into 60 equal parts called minutes ; each minute into 60 equal parts called seconds, &c. ; a degree is, therefore, only a relative idea, and not an absolute... 