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Template:SAAO Astronomical Museum

The Astronomical Museum of the South African Astronomical Observatory contains many of the instruments used over the past 200 years to make the discoveries for which the Observatory, formerly the Royal Observatory, Cape of Good Hope, became famous. It is located in the suburb of Cape Town named Observatory, after the pre-existing Royal Observatory located there. See "SAAO Museum web page". Retrieved December 30, 2025.

The Museum is in the McClean Building

The displays are arranged by topics important to making astronomical discoveries, such as computing, the spectra of stars, measuring their brightness, astronomical lenses and mirrors, photography and precision instruments for measuring positions.

The standard Weights and Measure of the Cape Colony, used in the 19th Century, are on display. The Observatory was trusted to be their keeper by the Colonial government.

Among its many treasures are one of Sir John Herschel's giant metal mirrors used for his survey of Nebulae from Claremont, Cape Town, as well as one made by his father William. We also have the lens used for the first photographic sky survey, made from Cape Town.

The Museum occupies the building and dome named after the noted British amateur astronomer, Frank McClean, who was its donor..[1]

The McClean telescope cluster

The architect of the building was the famous Sir Herbert Baker. Within it can be seen the (operational) large telescope(s) and a hydraulic rising floor: the McClean 18-inch visual, 24-inch photographic and 8-inch guide telescopes by the Grubb Telescope Company)[2] These were once among the worlds' largest.

Also in the building are a photographic darkroom, unchanged for 50 years, and the laboratory where the Museum is now located.

Instruments displayed in the former laboratory

The laboratory - the former spectroscopic laboratory of the McClean telescope - was converted into a museum in 1987, retaining the original 19th-century fittings. [3] Items on display include telescope models, measuring machines, altazimuth instruments by Dollond (1820) and Bamberg (ca 1900), calculating machines, early office equipment, electronic detectors, lenses from early telescopes including the photographic telescopes of Gill, a clockwork telescope drive, the time signal pistol, chemistry equipment etc.

Poster boards outline the history of the Observatory's activities such as the Time Service (that fired the Noonday Gun in Cape Town), the contributions of individual astronomers, such as Sir Thomas Maclear and Sir David Gill, who acquired worldwide fame.

On display is a poster on the work of Charles Piazzi Smyth who took the first photographs in South Africa in the 1840s.

A visit to the Museum is included on Open Nights (2nd and 4th Saturdays of each month at 8pm). Please see the "Visit Us" part of the SAAO website.

  1. ^ Baumann, N.; Winter, S. (2011). The South African Astronomical Observatory, A Heritage Survey. Observatory: South African Astronomical Observatory.
  2. ^ "Royal Observatory, Cape of Good Hope". The Observatory. XXV. August 1902.
  3. ^ Glass, I.S. (2010). "The Astronomical Museum of the SAAO". Monthly Notes of the Astronomical Society of Southern Africa. 69: 20. Bibcode:2010MNSSA..69...20G.

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