Astrolabe, historical artwork. An astrolabe was a historical astronomical device used to predict the positions of the stars and other astronomical bodies. It can also be used to determine local time from local latitude and vice-versa, as well as being used for surveying and triangulation. They were used for astrology, astronomy and navigation. The outer edge of the base material (which can be rotated with respect to the overlying markers) is marked in both degrees and the 24-hour division of the day. The inner circle is marked with the signs of the zodiac, while the other markers show other constellations. The angled pointers are used to measure angles of inclination for astronomical bodies.
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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