ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Venus and a star. The planet Venus (right, crescent) and a star (point, left), as seen in a transit instrument. A transit instrument is used to measure the positions of celestial objects as they transit a pre-defined point. Timings are recorded as the object passes the lines shown here. Transit instruments and the buildings that housed them, were a key feature of 19th-century observatories. Artwork from 'A Handbook of Descriptive and Practical Astronomy' (1890, 4th edition, volume II) by British author George Frederick Chambers (1841â1915).
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