Venus and Mercury, and How to Observe Them

Mercury and Venus - known as the "inferior planets" because they are closer to the Sun than the Earth is - have always been regarded as difficult and even dangerous targets for amateur astronomers. Recent advances in commercially-made instruments have, ho

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Other Titles in This Series Star Clusters and How to Observe Them Mark Allison Saturn and How to Observe It Julius Benton Nebulae and How to Observe Them Steven Coe The Moon and How to Observe It Peter Grego Supernovae and How to Observe Them Martin Mobberley Total Solar Eclipses and How to Observe Them Martin Mobberley Double & Multiple Stars and How to Observe Them James Mullaney The Herschel Objects, and How to Observe Them James Mullaney Galaxies and How to Observe Them Wolfgang Steinicke & Richard Jakiel

Peter Grego

Venus and Mercury, and How to Observe Them

ISBN: 978-0-387-74285-4

e-ISBN: 978-0-387-74286-1

Library of Congress Control Number: 2007937298 © 2008 Springer Science+Business Media, LLC All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed on acid-free paper 9 8 7 6 5 4 3 2 1 springer.com

Dedication For Jacy, my daughter

Thanks to Mike Inglis for having asked me to write this book, and for his help and advice as the project got underway. All the staff at Springer in the UK and USA have worked hard to produce this book, and I am deeply grateful to them. My special thanks go to John Watson and Harry Blom. The image contributors to this book have been tremendously helpful and generous – I hope my text does justice to your work, and that others are inspired to observe Mercury and Venus.

Acknowledgments

Acknowledgements

vii

Peter Grego has been a regular watcher of the night skies since 1976. He observes from his garden in Rednal, UK, with a variety of instruments, ranging from a 127 mm Maksutov to a 300 mm Newtonian, but his favourite instrument is his 200 mm SCT. Grego’s primary interests are observing and imaging the Moon and bright planets, but he occasionally likes to ‘go deep’ during the dark of the Moon. Grego has directed the Lunar Section of Britain’s Society for Popular Astronomy since 1984, and since 2006 has co-ordinated the Lunar Topographical Subsection of the British Astronomical Association. He edits five astronomy publications – Luna the journal of the SPA Lunar Section, The New Moon, journal of the BAA Lunar Section, the Newsletter of the Society for the History of Astronomy, the SPA News Circulars and Popular Astronomy magazine. In addition, he writes and illustrates the monthly MoonWatch column in UK’s Astronomy Now magazine, is observing advisor and columnist for Sky at Night magazine, and maintains