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The circumference of every circle is supposed to be divided into 360 equal parts called degrees, each degree into 60 equal parts called minutes, each minute into 60 equal parts called seconds.
Elements of Surveying: With the Necessary Tables - Page 21
by Charles Davies - 1830 - 306 pages

## A Treatise on Practical Mensuration

Anthony Nesbit - Measurement - 1859 - 482 pages
...angles which principally depend on the properties of the circle, and circular arcs. Every circle is divided into 360 equal parts called degrees, each degree into 60 equal parts called minutes, each minute into 60 equal parts called seconds, and so on by a sexigesimal division into thirds, fourths,...

## The Astro-meteoric Journal

1867 - 566 pages
...following pages. 8. Degrees &c. — AU circles, whether great or small, are supposed to be divided into 860 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and and each minute into 60 equal parts, called seconds, &c.* 9. An Angle is the inclination of two lines...