Spherical geometry other geometric concepts are defined as in plane geometry, but with straight lines replaced by great circles. Thus, in spherical geometry, angles are defined between great circles, resulting in a spherical trigonometry that differs from ordinary trigonometry in many respects; for example, the sum of the interior angles of a triangle exceeds 180 degrees. Spherical geometry is "not" elliptic geometry, but is rather a "subset" of elliptic geometry. For example, it shares with that geometry the property that a line has no parallels through a given point. Contrast this with Euclidean geometry, in which a line has one parallel through
OMB Circular A-130 of information in the operation of Federal programs. The initial release of the Circular provided a policy framework for information resources management (IRM) across the Federal government. Since the time of the Circular's first release in 1985, Congress has enacted several additional laws and OMB issued several guidance documents that related to information technology management in federal agencies. To account for these new laws and guidance, OMB has revised the Circular three times, in 1994, 1996, and 2000. A complete rewrite of the Circular to both update and to correct for known deficiencies has been considered since at least 2005,