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924 Elementary Problems and Answers in Solar System Astronomy This diagram shows the path (right ascension a and declination 0) of Mars on the star field during 1986 according to The Astronomical Almanac. Mars was in opposition on 7/10 and stationary on 6/10 and 8/12. The loop epitomizes the classical problem of understanding planetary motion (cf. problem 42). 8-G92-535 MOTION OF MARS ON THE STAR FIELD -200 1986 5/15 5/1 4/15 -25 - ____-' 8/15 8/1 -30 - PROGRADE ( EASTWARD) MOTION RETROGRADE (WESTWARD) MOTION___ a Elementary Problems and Answers in Solar System Astronomy James A. Van Allen Iowa City University of Iowa Press University of Iowa Press, Iowa City 52242 Copyright © 1993 by the University of Iowa Press All rights reserved Printed in the United States of America No part of this book may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and recording, without permission in writing from the publisher. This book was printed from camera-ready copy prepared under the direction of the author. Jacket/cover: This portion of the equatorial sky was photographed with a fixed camera by a team of students in the author's 1979-80 general astronomy class-John Finnegan, Scott Gallup, Larry Granroth, and Dave Peters. The open dome of the University of Iowa's Hills Observatory is in the foreground. Two problems for the reader: (a) Identify the bright stars in the constellation Orion (at right) and determine the duration of the time exposure. (b) Identify the bright star at the upper left. 97 96 95 94 93 C 5 4 3 2 97 96 95 94 93 P 5 4 3 2 Library of Congress Cataloging-inPublication Data Van Allen, James Alfred, 1916924 elementary problems and answers in solar system astronomy / by James A. Van Allen. p. cm. Includes bibliographical references. ISBN 0-87745-433-7, ISBN 0-87745-434-5 (pbk.) 1. Solar system-Miscellanea. I. Title. II. Title: Nine hundred twentyfour elementary problems and answers in solar system astronomy. QB502.V36 1993 523.2-dc20 Printed on acid-free paper 93-24605 CIP ...