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Название: Warplanes of the Future
Автор: David Oliver, Mike Ryan
Издательство: MBI Publishing Company
Год: 2000
Формат: PDF
Страниц: 177
Размер: 23,9 МБ
Язык: Английский

In the time since man first battled with his fellow man, aerial warfare takes up a milli-second. Heavier-than-lir flight is less than a century old and it was not until 1910 that a military firearm was fired or a dummy )omb dropped from an aeroplane in flight. In the following decade, World War I accelerated aviation echnology out of all recognition and airplanes had become an important weapon.

Название: Yearbook of Astronomy 2020
Автор: Brian Jones
Издательство: White Owl
Год: 2019
Формат: True PDF
Страниц: 370
Размер: 67.3 Mb
Язык: English

Maintaining its appealing style and presentation, Yearbook of Astronomy 2020 contains comprehensive jargon-free monthly sky notes and an authoritative set of sky charts to enable backyard astronomers and sky-gazers everywhere to plan their viewing of the year’s eclipses, comets, meteor showers and minor planets as well as detailing the phases of the moon and visibility and locations of the planets throughout the year. To supplement all this is a variety of entertaining and informative articles, a feature for which the Yearbook of Astronomy is known.