Stars and Galaxies
Stars and Galaxies
9th Edition
ISBN: 9781305120785
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 3, Problem 10P
To determine

The angular diameter of sun if sun were located in place of moon.

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You are in a car 54.9 meters away from a street sign (distance from your face to the sign). The text letters on the street sign are 15.2 cm tall. What is the visual angle of the street sign letters in arc minutes?
The nearest star to our sun is Proxima Centauri, at a distance of 4.3 light-years from the Sun. A light-year is the distance that light travels in one year (365 days). How far away, in kilometers, is Proxima Centauri from the Sun?Express your answer using two significant figures.
Consider a star at a distance of 100 light years from the Earth and is moving relative to the Earth at a constant velocity of 70000 km/hr perpendicular to its line of sight from the Earth. What is the change of its angular position on our sky when viewed by us now and by the ancient Egyptian 6000 years ago? Ignore all other effect, e.g., the axial precession of the Earth. 1. (A) 0.24 arcsecond (В) 13 arcminutes (C) 0.5 degree (D) 2.6 degrees (E) 5.0 degrees
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