A primary astronomy .. . The curve line which bounds it. 72. What is the Diameter ?It is a right line passing through the center, and terminating each wayin the circumference. 73. Describe the Radius of a Circle. It is a right line drawn from its center to any pointin the circumference. [The plural of radius is radii; and as radii proceed from a common center, light,which proceeds from a luminous point in all directions, is said to radiate; and thelight thus dispersed is sometimes called radiations or radiance.] 74. How is the Circumference of a Circle divided ?Into Signs, Degrees, Minu
A primary astronomy .. . The curve line which bounds it. 72. What is the Diameter ?It is a right line passing through the center, and terminating each wayin the circumference. 73. Describe the Radius of a Circle. It is a right line drawn from its center to any pointin the circumference. [The plural of radius is radii; and as radii proceed from a common center, light,which proceeds from a luminous point in all directions, is said to radiate; and thelight thus dispersed is sometimes called radiations or radiance.] 74. How is the Circumference of a Circle divided ?Into Signs, Degrees, Minutes, and Seconds. [The student will probably recognize these divisions as what he has previouslylearned among his Arithmetical Tables, under the head of Circular Measure.] 75. What is a Sign ? The twelfth part of a circle. 76. What is a Degree ? The 30th pcvrt of a sign, or the360th part of a circle. 77. What is a Minute?The 60th part of a degree, or the 12,600th part of a §. What is a Second? PARTS OF A
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectastronomy, bookyear18
