Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 19, Problem 44Q
To determine
About annular eclipse of the Sun, whether they were more or less prominent few billion years ago, as compared to present. Given that the radius of Sun has increased, and the size of Moon’s orbit has also increased till now.
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Part 3
1. The diameter of the Sun is 1,391,400 km. The diameter of the Moon is 3,474.8 km. Find
the ratio, r= Dsa/Dsvan between the sizes.
2. From the point of view of an obs erver on Eanth (consider the Earth as a point-like object),
during the eclipse, the Moon covers the Sun exactly. Sketch a picture to illustrate this
fact. Use a nuler to get a straight line. Your drawing does not need to be in scale.
3. The Sun is 1 Astronomical Unit (AU) away from the Earth. Find the distance between the
Earth and the Moon in AU's using the ratio of similar triangles. Show your work.
DEM=
AU.
Convert this to kilometers. Use 1 AU = 149,600,000 km.
DEM =
km.
A solar eclipse is only visible over a narrow strip on the Earth's surface. This is most closely associated with:
Select one alternative:
The ways in which our view of the sky depends on latitude.
The combination of the Earth's rotation on its axis and its movement around the sun.
The elliptical nature of the moon's orbit.
The perspective dependence associated with parallax.
Solar eclipses are actually visible to everyone on the daylight side of the earth.
Mercury's orbit ranges from 46 to 70 million km from the Sun, while Earth orbits at about 150 million km.
a. The Sun has a 30-arc-minute diameter viewed from Earth; what range of sizes does it have when viewed from Mercury?
When Mercury is 46 million km from the Sun, the Sun has a diameter of
When Mercury is 70 million km from the Sun, the Sun has a diameter of
arc-minutes.
arc-minutes.
b. At Mercury's orbital extremes, how many times stronger is the Sun's radiation on Mercury than on Earth?
At 46 million km, the Sun's radiation is
times stronger than on Earth.
At 70 million km, the Sun's radiation is
times stronger than on Earth.
Chapter 19 Solutions
Universe
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