2019 Guide to the Night Sky: Bestselling month-by-month guide to exploring the skies above Britain and Ireland. Wil Tirion

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Copyright

      Published by Collins

      An imprint of HarperCollins Publishers

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      Bishopbriggs

      Glasgow G64 2QT

       www.harpercollins.co.uk

      In association with

      Royal Museums Greenwich, the group name for the National Maritime Museum,

      Royal Observatory Greenwich, Queen’s House and Cutty Sark

       www.rmg.co.uk

      © HarperCollins Publishers 2018

      Text and illustrations © Storm Dunlop and Wil Tirion

      Photographs © see acknowledgements here

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

      eBook Edition © Sep 2018

      ISBN 9780008311643

      Version: [2018-07-14]

      Contents

       Cover

       Title Page

Copyright

Introduction

       The Constellations

The Northern Circumpolar Constellations

Comets and the Moon

Map of the Moon

       Introduction to the Month-by-Month Guide

       Month-by-Month Guide

       January

       February

       March

       April

       May

       June

       July

       August

       September

       October

       November

       December

       Glossary and Tables

       Acknowledgements

       Further Information

       About the Publisher

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 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. As the diagram shows, during June and most of July full darkness never occurs at the latitude of London, and at Edinburgh nautical twilight persists СКАЧАТЬ