The cosmography of the Appearence is the science that deals with mapping and organizing the Appearence galaxy, such as the position, formation and concentration of orbital bodies and other Appearence-based features, and is largely associated, in the core, with cosmopolitics (territory of nations).
The Appearence is a nine-arm single-core fairly large galaxy, having a diameter of around 140,000 lightyears (1.3 exameters, 42,000 parsecs). The majority of its arms are steep - they make a full 180° from the core before expiring. The Appearence mainly consists of regular nebulae and regular stars, however blue stars and other cosmographical formations may also be common.
Notably, the Appearence core's strength fluctuates immensely. At the moment, its strength is weak (though around 150% of the minimum expected strength), making the core an optimal place for settling space-age civilization due to the high concentration of stars. In around 60 million years, the core will reach its minimum strength, meaning a slight deformation of its arms and inflation of its general diameter, however in another 1540 million years, it will reach its maximum strength (around 10000% of current), and the core will become uninhabitable and unstable for space-age civilizations.
Core civilization have introduced their own mapping systems, however the most common in use is the tile-like galactic sectors and arm-based galactic super-regions, regular regions and sub-regions. The Appearence would have 400 galactic sectors (A1 to T20), all square and all the same size. J9 to K10 are the four tiles surrounding the very core of the galaxy. Added to this, there is a commonly accepted galactic orientation, so that referencing to galactic directions is easier. Instead of using the terms "north", "east", "south" and "west", they are formally prefixed with "galactic", though casually may not be - the context usually determines whether or not they are. In the current region system, there are ten super-regions, (arm one, arm two ... arm nine, the core), and five regular regions (often just called regions). Regions are often not contained within each other for historical reasons. See here for a map of super-regions and regular regions (the file is too large to be displayed and read at an appropriate size).
There are currently seven regions, six of them established by the core civilizations: