The Twilight's PeakTRAVELLER
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Astrography

The science of mapping interstellar space. Basic to any science of mapping is a coordinate system. The system used by the Imperium is based on rings of longitude, rays of latitude, and parsecs. By convention, rays of latitude are measured from a starting point at Reference/Core, this world being at ray 0000 and on the ring 10 000 parsecs from the centre of the galaxy. The system is highly Imperio-centric, and liable to break down beyond certain limits. However it admirably serves within the area surrounding the Imperium. Other states use different conventions, but the Imperial system is widely accepted by many client states. In ordinary discourse, a world is refered to by its name, sector and/or subsector. For example the home of the first Barracks Emperor, Olav, is Rhylanor/Rhylanor/Spinward Marches)