South African Astronomical Observatory
Every day at noon, a cannon fires on Signal Hill — triggered by a time signal sent from this observatory.
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Africa's first scientific institution, founded as the Royal Observatory in 1820, the Cape Town headquarters preserves the original 1829 buildings alongside historic telescopes still standing in their domes. The serious telescope work now happens in Sutherland, 370 km away, but this is where 200 years of southern-sky astronomy began — and where the national astronomy library still operates.
What to look for
- Historic telescopes housed in their original domes on the grounds
- A small museum displaying period scientific instruments
- The main building completed in 1829 at a cost of £30,000
The headquarters sit in Cape Town's Observatory suburb; a national astronomy library is on site for researchers and serious visitors.
South African Astronomical Observatory is one of 7 sights worth the detour in Cape Town, all bundled offline in Voyage GO — download the Cape Town pack and it sits on your map with no signal, filling your travel passport the moment you walk past.
More to see in Cape Town
- Cape Town StadiumThe World Cup bowl squeezed between Signal Hill and the Atlantic is still Cape Town's biggest live-sport stage.
- Castle of Good HopeSouth Africa's oldest building — a pentagonal VOC fort that once faced the sea and now sits landlocked by centuries of reclaimed ground.
- Table Mountain National ParkThe park runs the full spine of the Cape Peninsula — city overlooks at one end, the most southwestern point of Africa at the other.
- Kirstenbosch National Botanical GardenThe world's first garden built exclusively for native plants — founded in 1913 when nobody else thought invasive species were a problem.
- Royal Observatory, Cape of Good HopeThe hill where astronomers first measured the distance to a star — then lost the credit for it.
- The Blue TrainA 27-hour rolling palace between Cape Town and Pretoria — the same carriages that carried Nelson Mandela and Margaret Thatcher across 1,600 kilometres of South Africa.