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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
The Cape of Good Hope is at the southern tip of the Cape Peninsula, about 2.3 kilometers (1.4mi) west and a little south of Cape Point on the south-east corner. Cape Town is about 50 kilometers to the north of the Cape, in Table Bay at the north end of the peninsula. The peninsula forms the western boundary of False Bay.
The written history of the Cape Colony in what is now South Africa began when Portuguese navigator Bartolomeu Dias became the first modern European to round the Cape of Good Hope in 1488. [1] In 1497, Vasco da Gama sailed along the whole coast of South Africa on his way to India, landed at St Helena Bay for 8 days, and made a detailed ...
1899–1910. v. t. e. The history of the Cape Colony from 1806 to 1870 spans the period of the history of the Cape Colony during the Cape Frontier Wars, which lasted from 1779 to 1879. The wars were fought between the European colonists and the native Xhosa who, defending their land, fought against European rule. Map of the Cape Colony in 1809.
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria.
The Royal Observatory, Cape of Good Hope, is a former scientific institution in South Africa. [1] Founded by the British Board of Longitude in 1820, its main building is now the headquarters building of the South African Astronomical Observatory. The institution was located on a small hill 5 kilometres (3.1 mi) south-east from the centre of ...