Apparent Diameter 15)? As we mentioned in this section,

Chapter 3, Problem 3.1.365

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Apparent Diameter 15)? As we mentioned in this section, for small central angles in circles with large radii, the intercepted arc and the chord are approximately the same length. Figure 17 shows a diagram of a person looking at the moon. The arc and the chord are essentially the same length and are both good approximations to the diameter. :r of leeL 16)? Fignre 17 Chapter 3 Radian Measure 'fl4rl /1 SECTION 3.5 In astronomy, the angle a at which an object is seen by the eye is called the apparent diameter of the object. Apparent diameter depends on the size of the object and its distance from the observer. To three significant figures, the diameter of the moon is 3,470 kilometers and its average distance to the earth is 384,000 kilometers. The diameter of the sun is 1,390,000 kilometers and its mean distance to the earth is 150,000,000 kilometers .The moon and the sun are, at first sight, about equal in size. How can you explain this apparent similarity in size even though the diameter of the sun is about 400 times greater than the diameter of the moon?