The Philip's Pocket Star Atlas is a highly practical atlas in a compact format for use out of doors. It contains a series of maps showing the entire night sky, as well as a mass of useful astronomical data. It is suitable for use anywhere in the world. This popular atlas is now in its fourth edition, for which it has been revised, updated and expanded. It presents the sky in a series of 16 maps, showing stars down to magnitude 5.5. This means all stars are visible to the naked eye in semi-rural conditions.