The Western Chalukya Empire ruled most of the western Deccan, South India, between the 10th and 12th centuries. This Kannadiga dynasty is sometimes called the Kalyani Chalukya after its regal capital at Kalyani, today's Basavakalyan in the modern Bidar District of Karnataka state, and alternatively the Later Chalukya from its theoretical relationship to the sixth-century Chalukya dynasty of Badami. Prior to the rise of the Western and Eastern Chalukyas, the Rashtrakuta Empire of Manyakheta controlled most of the Deccan and Central India for over two centuries. In 973, seeing confusion in the Rashtrakuta Empire after a successful invasion of their capital by the ruler of the Paramara dynasty of Malwa, Tailapa II, a feudatory of the Rashtrakuta dynasty ruling from Bijapur region, defeated his overlords and made Manyakheta his capital. The dynasty quickly rose to power and grew into an empire under Someshvara I who moved the capital to Kalyani. (Full article...)
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A plan of the cities of London and Westminster, and borough of Southwark is a 1746 map of the City of London and surrounding area, surveyed by John Rocque and engraved by John Pine. Rocque combined two surveying techniques: he made a ground-level survey with a compass and a physical metal chain – the unit of length also being the chain. Compass bearings were taken of the lines measured. He also created a triangulation network over the entire area to be covered by taking readings from church towers and similar high places using a theodolite made by Jonathan Sisson (inventor of the telescopic-sighted theodolite) to measure the observed angle between two other prominent locations. The process was repeated from point to point. This image depicts all 24 sheets of Rocque's map.