Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 26
ths (40/„) of an inch, ABCwould be an angle of fort// degrees and nine minutes(40° 9.) Degrees are denoted by the following char-acter, °; minutes thus, ; and seconds thus, . 12. A RIGHT Angle. A right angle contains 90°,and can be thus constructed. Draw two diametersthrough any circle, dividing… … RIGHT ANGLE. How is its size computed ? Describe from the figure. How are degrees, minutes, andseconds denoted ? What is a right angle, and how is it constructed ? EXPLANATORY CHAPTER. 19 tains ninety degrees. Tims, in Fig. 3, the two diame-ters, AB and DE, dividing the circumference of the…
Astronomy
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