Modern astronomers are not instructed on the constellations and pay little attention to them except as a naming convention for stars. Positional information is nearly always either equatorial (ra,dec), or galactic (gl,gb), or supergalactic (SGL, SGB). To improve the speed in which information on a region can be extracted from a database, a scheme called Hierarchical Triangular Mesh (HTM), is often used. The sky is divided into three sections (0,1,2) and each of those is divided into 3 sections (00,01,02,10,11...) and this iterated until the level of finest size is reached. One can address the finest region by using all of the digits or a larger region by dropping some of the final digits.
No comments:
Post a Comment