Listed buildings in Lancaster, Lancashire century. The town stands at the lowest crossing of the River Lune, and received its first borough charter in 1193. In addition to being a market town, it became the judicial centre of the county of Lancashire, the castle being converted to serve this purpose in the 18th century. Also in the 18th century, in order to trade with the Americas, St George's Quay, with its warehouses and houses, was developed. Towards the end of that century the Lancaster Canal was built, linking the town with Preston. And in the 19th century railways came to the town, including what is
Spherical lune Spherical lune In spherical geometry, a spherical lune is an area on a sphere bounded by two half great circles which meet at antipodal points, and is an example of a digon, {2}, with dihedral angle θ. The word "lune" derives from "luna", the Latin word for Moon. A spherical wedge is the volume of space bounded by two planes passing through a sphere center and the surface of the sphere. Great circles are the largest possible circles (circumferences) of a sphere; each one divides the surface of the sphere into two equal halves. Two great circles always intersect at