The point of intersection between the ecliptic and the celestial equator at which the Sun passes from south to north of the celestial equator during its apparent annual motion. The instant of this eve
nt. It occurs on March 20, 21 or rarely 19. At the vernal equinox, as with the autumnal equinox, night and day are equal in length world over. Several thousands years ago the vernal equinox was in Aries, but because of precession it has now slid west into Pisces. Right ascension and celestial longitude are measured from the vernal equinox.
Indicates the release identifier. When usedto indicate the release of the SPASE data model, it is a in the formMajor.Minor.Fix where Major: A significant change in the architecture of themodel or rewr
ite of the implementation. This includes major changes indesign or implementation language. This number starts at 0 (zero). Minor: Anaddition of terms or features that require changes in documentation/externalAPI. This number starts at 0 (zero). Fix: Any change that doesn't requiredocumentation/external API changes. This number starts at 0 (zero).