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Positional Astronomy at Melbourne Observatory
Image: Album - Photographs
Source: Museum Victoria
Along with the observations required for timekeeping, positional astronomy occupied the largest part of the Observatory's work. Positional astronomy consisted of the accurate and repeated observations of stars, and then the reduction of the observations to provide a precise location of the star in the sky and its magnitude. When the Melbourne Observatory commenced, this involved the use of the transit telescope and accompanying equipment to fix the location. By the 1880s celestial photography had improved so that it was possible to take series of photos of the sky, then measure the position and magnitude of stars on the photographic plates.
The work of the Melbourne Observatory was of particular importance because it was one of the best equipped observatories in the southern hemisphere, and thus able to observe stars that could not be seen from the European and North American observatories.
In the early years Melbourne Observatory became involved in several international projects. In 1863 Government Astronomer Robert Ellery took observations of the parallax of Mars in conjunction with Greenwich Observatory near London and Pulkowa Observatory in St Petersburg; this was to provide measurements that would aid the calculation of the distance of the Earth from the Sun. The following year, in collaboration with Greenwich Observatory, the Observatory was making observations of the polar distances of stars, to measure the amount of apparent displacement due to the refraction of the Earth's atmosphere. Prior to the Transit of Venus in 1874, the Observatory made large numbers of transit observations of stars that would be used by expeditions from the northern hemisphere observatories to locate the precise position of their field observatories.
Several projects were aimed at measuring as accurately as possible the distances between the planets and the Sun, and therefore understanding the mechanics of the solar system. For example, in 1931 the Observatory used its astrographic telescope to photograph the passage of the minor planet Eros; the photographic plates were sent to Greenwich where astronomer Spencer Jones used them with those from other observatories to more accurately measure solar parallax. His work would not be improved upon until the advent of radio astronomy after the Second World War permitted radar measurements of the distance between Earth and Venus.
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Technical Report - S.P. Langley, Stories of Experiments in Mechanical Flight, 1898
A short summary of work on the design of heavier than air flying machines up to 1897 by Samuel Pierpont Langley. This copy was originally received by the Melbourne Observatory and held ...
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Technical Report - The Langley Aerodrome, 1901
A summary of work on the design of the Aerodrome, a heavier than air flying machine built by Samuel Pierpont Langley. This copy was originally received by the Melbourne Observatory and ...
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Technical Paper - E.C. Huffaker & S.P. Langley, On Soaring Flight, 1898
Summary of experiments in non-powered flight by E.C Huffaker with an introduction by Samuel Pierpont Langley. This copy was originally received by the Melbourne Observatory and held as ...
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Technical Report - Graham Bell's Tetrahedral Kites, 1904
Summary report with four photographic illustrations of Alexander Graham Bell's experimental kites. It is an extract from the Smithsonian Report for 1903, pp183-185. The copy was origina ...
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Glass Plate Box - Plate Carrier, Great Melbourne Telescope, 1870s
Wooden box used for carrying glass photographic plates and their holders for the Great Melbourne Telescope at the Melbourne Observatory, 1870s.
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Hood - South Collimator, Melbourne Observatory, circa 1880s
Hood for the South Collimator Field Lens at Melbourne Observatory, circa 1880s. The South Collimator was erected some distance south on the meridian line of the 8 inch transit telescope ...
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Digital Image - Telegram, R.L.J. Ellery to Mr Moore, Crown Lands Office, Melbourne, 1873
Telegram from R.L.J. Ellery, Government Astronomer to Mr Moore, Crown Lands Office, 14 January 1873, requesting the attendance of Frederick Kemp at Melbourne Observatory. Kemp at the t ...
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Photograph - Orion Nebula, Taken with the Great Melbourne Telescope, Victoria, 26 Feb 1883
Photograph of Orion Nebula, taken by Joseph Turner with the Great Melbourne Telescope on 26 Feb 1883, with an exposure of 4 minutes.
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Photograph - K Crucis, Taken With The Great Melbourne Telescope, Victoria, 3 Mar 1883
Photograph of the Kappa Crucis Cluster, named the 'Jewel Box', in the constellation of Crux. Photograph taken by Joseph Turner with the Great Melbourne Telescope on March 3 1883, with a ...
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Photograph - 'Absolute House', Melbourne Observatory, South Yarra, Victoria, circa 1935
Photograph of the Absolute House at Melbourne Observatory, circa 1935. Built in 1861 the Absolute House measured geomagnetic elements along with the Differential House. Photograph take ...
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