Storm Dunlop - 2020 Guide to the Night Sky Southern Hemisphere

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EXPANDED AND REVISEDA comprehensive handbook to the planets, stars and constellations visible from the southern hemisphere. 6 pages for each month covering January–December 2020.Diagrams drawn for the latitude of southern Australia, but including events visible from New Zealand and South Africa.Written and illustrated by astronomical experts, Storm Dunlop and Wil Tirion.Content includes:• Advice on where to start looking• Easy-to-use star maps for each month with descriptions of what to see• NEW Special, detailed charts for positions of planets, minor planets and comets in 2020• NEW Seasonal charts• NEW Details of dark sky sites• Details of objects and events you might see in 2020• Diagrams of notable events visible from Australia, and some for New Zealand and South Africa

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Copyright Published by Collins An imprint of HarperCollins Publishers - фото 1

Copyright

Published by Collins

An imprint of HarperCollins Publishers

Westerhill Road

Bishopbriggs

Glasgow G64 2QT

www.harpercollins.co.uk

© HarperCollins Publishers 2019

Text and illustrations © Storm Dunlop and Wil Tirion

Photographs © see acknowledgements here

Collins ® is a registered trademark of HarperCollins Publishers Ltd

All rights reserved under International and Pan-American Copyright Conventions. By payment of the required fees, you have been granted the non-exclusive, non-transferable right to access and read the text of this e-book on screen. No part of this text may be reproduced, transmitted, downloaded, decompiled, reverse engineered, or stored in or introduced into any information storage and retrieval system, in any form or by any means, whether electronic or mechanical, now known or hereafter invented, without the express written permission of HarperCollins.

The contents of this publication are believed correct at the time of printing. Nevertheless the publisher can accept no responsibility for errors or omissions, changes in the detail given or for any expense or loss thereby caused.

HarperCollins does not warrant that any website mentioned in this title will be provided uninterrupted, that any website will be error free, that defects will be corrected, or that the website or the server that makes it available are free of viruses or bugs. For full terms and conditions please refer to the site terms provided on the website.

A catalogue record for this book is available from the British Library

eBook Edition © Sep 2019

ISBN 9780008354985

Version: 2019-10-15

Contents

Cover

Title Page

Copyright

Time Zones

Introduction

The Constellations

The Southern Circumpolar Constellations

The Summer Constellations

The Autumn Constellations

The Winter Constellations

The Spring Constellations

The Moon and the Planets

The Moon

Map of the Moon

Eclipses

The Planets

Minor Planets

Comets

Introduction to the Month-by-Month Guide

Month-by-Month Guide

January

February

March

April

May

June

July

August

September

October

November

December

Dark Sky Sites

Glossary and Tables

Acknowledgements

Further Information

About the Publisher

Time Zones

The times of events in this book are given in Coordinated Universal Time (UTC), here abbreviated to Universal Time (UT). This time is equivalent to the time on the Greenwich meridian (GMT), and is used by astronomers around the world so that observations may be compared easily, without having to convert from local (zone) times. Universal Time is always given on a 24-hour clock (sometimes known as ‘military time’ or ‘Zulu’, ‘Z’). In many countries times are generally given as a.m. or p.m. and such times are shown on the charts showing the appearance of the sky for each month. Giving the times of individual events as a.m. or p.m. would be complex and confusing, so those times may need to be converted from UT.

Australia

Australian time zones are shown on this map. There are three: Australian Western Standard Time (AWST); Australian Central Standard Time (ACST); and Australian Eastern Standard Time (AEST). Some individual states (Western Australia, Northern Territory and Queensland) do not use daylight saving time (DST) during the summer months. To obtain local (zone) time from Universal Time (UT), add the hours shown in this table. If the result is greater than 24, subtract 24 hours. If the initial or subsequent result is less than 12:00, the zone time is a.m.; if greater, subtract 12 hours to get the time p.m. The dates when Daylight Saving Time begins and ends are shown on the individual calendars inside the book. At the time of writing, it is introduced on the first Sunday of October and ends on the first Sunday in April.

Time zone Winter Summer Time zone Winter Summer Australia Add - фото 2
Time zone Winter Summer Time zone Winter Summer
Australia Add hours shown to UT Australian Capital Territory 10:00 (AEST) 11:00 (DST)
Western Australia 08:00 (AWST) no DST Victoria 10:00 (AEST) 11:00 (DST)
Northern Territory 09:30 (ACST) no DST Tasmania 10:00 (AEST) 11:00 (DST)
Queensland 10:00 (AEST) no DST
South Australia 09:30 (ACST) 10:30 (DST) New Zealand 12:00 (NZST) 13:00 (NZDT)
New South Wales 10:00 (AEST) 11:00 (DST) South Africa 02:00 (SAST) no DST

New Zealand

New Zealand uses a single time zone for the North and South Islands: New Zealand Standard Time (NZST) which is 12 hours ahead of UT. Daylight saving time (NZDT) is used in the summer, and begins on the last Sunday in September and ends on the first Sunday of April. (Note that it begins one week before the Australian start of Daylight Saving Time.) As for Australia, the hours shown above should be added to Universal Time (UT). If the result is greater than 24, subtract 24 hours. If the initial or subsequent result is less than 12:00, the zone time is a.m.; if greater, subtract 12 hours to get the time p.m. The dates when Daylight Saving Time begins and ends are shown on the individual calendars inside the book.

South Africa

South Africa uses a single time zone: South Africa Standard Time (SAST). This is two hours in advance of UT. Daylight Saving Time / Summer Time is not used. To obtain local (zone) time, add two hours to UT. If the result is greater than 24, subtract 24 hours. If the initial or subsequent result is less than 12:00, the zone time is a.m.; if greater, subtract 12 hours to get the time p.m.

Introduction

The aim of this Guide is to help people find their way around the night sky, by showing how the stars that are visible change from month to month and by including details of various events that occur throughout the year. The objects and events described may be observed with the naked eye, or nothing more complicated than a pair of binoculars.

The conditions for observing naturally vary over the course of the year. During the summer, twilight may persist throughout the night and make it difficult to see the faintest stars. There are three recognized stages of twilight: civil twilight, when the Sun is less than 6° below the horizon; nautical twilight, when the Sun is between 6° and 12° below the horizon; and astronomical twilight, when the Sun is between 12° and 18° below the horizon. Full darkness occurs only when the Sun is more than 18° below the horizon. During nautical twilight, only the very brightest (navigation) stars are visible. During astronomical twilight, the faintest stars visible to the naked eye may be seen directly overhead, but are lost at lower altitudes. At Sydney, full darkness persists for about six hours at mid-summer. Even at Christchurch, NZ (not shown), full darkness lasts about four hours. By contrast, as far south as Cape Horn, at mid-summer nautical twilight persists, so only the very brightest stars are visible.

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