Astronomy Today (9th Edition)
Astronomy Today (9th Edition)
9th Edition
ISBN: 9780134450278
Author: Eric Chaisson, Steve McMillan
Publisher: PEARSON
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Chapter 1, Problem 7P
To determine

The number of times by which the Sun is larger than the Moon if the Moon lies 384,000 km from Earth, the Sun lies 150,000,000 km from Earth, and both the Sun and the Moon have the same angular size as seen from Earth.

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The sun of galaxy X has a diameter of about 796,000 mi with a maximum distance from Planet X's surface of about 78,700,000 mi. Planet X's moon has a diameter of 2,731 mi. For a total solar eclipse to occur, the moon must pass between the sun and Planet X. The moon must also be close enough to Planet X for the moon's umbra (shadow) to reach the surface of Planet X. The maximum distance that the moon can be from Planet X and still have a total solar eclipse occur i (Round to the nearest thousand as needed )
d. Diameter of the Sun I h A d. Standing on the beach at sunset, you extend the tip of your finger at your full arm length from your face, covering the Sun. Upon moving your finger around, you find that only about half of its width is needed to completely cover the Sun's diameter. You measure your finger width to be 0.5 inches. You know your arm length to be 28.0 inches. You have be told that the Sun is approximately 93 million miles away. Use this information to determine the approximate diameter of the Sun, filling in the table below with the proper quantities measure in meters. 1 = ½ finger g = eye level height d = object h = Diameter f= object height from level to top of eye level X = Arm A = angle width length distance from eye of the Sun object
From Earth, the angular size of the Moon is 0.5 degree. The distance between the Earth and the Moon is 384,400 km. Use the small-angle formula to find the size of the Moon. Compare the number to the distance of the Moon given previously. It is consistent?
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