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Combe Hill is a causewayed enclosure, near Eastbourne in East Sussex, on the northern edge of the South Downs. It consists of an inner circuit of ditch and bank, incomplete where it meets a steep slope on its north side, and the remains of an outer circuit. Causewayed enclosures were built in England from shortly before 3700 BC until at least 3500 BC; their purpose is not known. The enclosure has been excavated twice: in 1949, by Reginald Musson; and in 1962, by Veronica Seton-Williams, who used it as a training opportunity for volunteers. Charcoal fragments from Musson's dig were later dated to between 3500 and 3300 BC. Musson also found a large quantity of Ebbsfleet ware pottery in one of the ditches. Seton-Williams found three polished stone axes deposited in another ditch, perhaps not long after it had been dug. The site is only 800 metres (870 yd) from Butts Brow, another Neolithic enclosure; both sites may have seen Neolithic activity at the same time. (Full article...)

The plate carrée projection is a map projection in which the horizontal coordinate is the longitude and the vertical coordinate is the latitude. The name derives from the French for "flat square". The plate carrée is a special case of the equirectangular projection, which has been in use since the earliest days of spherical cartography: the Roman mathematician Ptolemy attributed its invention to Marinus of Tyre, in around AD 100. This composite satellite image, titled "Blue Marble", was produced by NASA and shows Earth's land surface, shallow water and shaded topography.

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