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Arc of 30th Meridian #1 - Buffelsfontein Traditional Geocache

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Geocache Description:


Follow the footsteps of Sir David Gill, whose work on the Arc of the 30th Meridian has formed the basis for the modern geodesy of today.

Map of Africa

This beacon is one in a series of 26, which are the first set of historic astronomical stations measured in order to establish the groundwork of the Arc of the 30th Meridian. The Arc of the 30th Meridian is a set of triangulation measurements effectively creating an arc from Port Elizabeth in South Africa to Cairo in Egypt through the entire African continent.

The purpose of the measurement was to determine the size and shape of the Earth.

This beacon represents the Southern most point of a chain of triangles Measured along the 30th meridian through Botswana, Mozambique, Zimbabwe, Zambia, Tanzania, Burundi,  Uganda, the Democratic Republic of Congo, Sudan and ending near Cairo in Egypt.

Prior to 1999 the beacon was also the origin of the geodetic survey of South Africa.
The project was initiated by Sir David Gill, the Astronomer Royal at the Cape in 1879 and the final measurements were completed in the Sudan 1954.
The arc, known as the Arc of the 30th Meridian, can be connected across the Mediterranean Sea through Crete and Belarus to a similar arc measured through Europe terminating at North Cape in Norway. The European arc is known as the Struve Arc and together these two arcs cover nearly 105º in latitude which is over 11650 Km in length.

This plaque was unveiled by the President of the Institute of Professional Land Surveyors of the Eastern Cape, Mr C J Bollaert-Davies, on 8 June 2004, 125 years after the initiation of the project and 50 years after the completion of measurements.

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The original cache was adopted by Team_Gecko from Angstrom on 26 December 2006. The cache has now been adopted by amaSoekSoek on 6 Jan 2009. Thanks Team_Gecko!

Enjoy the hunt!!

Additional Hints (Decrypt)

Uvag - Fgneg jnyx gb pnpur urer: F33 59.svir svir frira R25 31.gjb fvk guerr

Decryption Key


(letter above equals below, and vice versa)