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Star trails cover the sky on a picture with an exposure of more than
10 hours. For an enjoyable gazetteer to the stars that left the trails,
read The Monthly Sky Guide by Ian Ridpath and Will Tirion (Cambridge, pp
64, pounds sterling 6.95). A new edition of a beginner’s guide to starwatching,
the maps are clear – the fist drawn on them helps you to measure the spread
of a constellation with your hand.