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AUSTRALIEN

Utgiven den: 30 Sept. 2025.-
3 Värden tandade
Typ: Miniark (x märken illustrerade)
Tryckmetod: offset
Bredd (mm): 135
Höjd (mm): 80

Beskrivning : 3 Australian Optical Observatories :

- The Melbourne Observatory stands adjacent to the city’s Royal Botanic Gardens and commenced operation in 1863. Soon after, a 48-inch (120-centimetre) telescope, known as the Great Melbourne Telescope, was installed. At the time it was the largest fully steerable telescope in the world and participated in the global viewing of the transit of Venus in 1874.
A contemporary illustration of the Great Melbourne Telescope, currently under restoration, and an 1875 photograph of the Moon as seen through this telescope.

- The Siding Spring Observatory opened in 1964 near Coonabarabran in New South Wales.
The observatory houses more than sixty telescopes, including the Anglo-Australian Telescope (AAT). With a 3.9-metre mirror it is the largest optical telescope in Australia.
It is equipped with a robotic spectrograph that can simultaneously observe hundreds of galaxies and stars and has also been used to carry out important southern sky surveys.
The AAT and the Australian Astronomical Observatory at Siding Spring. The background shows the Orion Nebula as seen through the AAT.

- The Sydney Observatory was opened in 1858 in Sydney suburb of Millers Point. The observatory was of crucial importance in Australia’s early scientific history and is today a working museum.
The historic 29-cm refractor telescope, installed in 1874 and today the oldest telescope in Australia still in regular use. This telescope was used to view the 1874 Transit of Venus, with a detail from contemporary observations shown in the background.

Information om värdena :
etoile AIE 41/43 C     sheetlet of 3:
etoile AIE 41    1.70$ Melbourne Observatory, Victoria
etoile AIE 42    1.70$ Siding Spring Observatory, NSW
etoile AIE 43    1.70$ Sydney Observatory, NSW

Yvert  : Bloc 402
Scott  : 5961b

Designad av : Andrew Hogg

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Nyckelord : #Månen och sonder, #Teleskop.

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