Reference frame · B1950.0
The B1950 Epoch
The older standard epoch, defined by the beginning of the Besselian year 1950, to which many historical star catalogues and coordinates are referred. Converting between B1950 and J2000 positions is a routine but necessary step when using older data.
Bodies, frames & concepts
Knowledge connections
- Associated withThe J2000 Epoch
- Associated withThe Ecliptic & Equinox
- Associated withThe Fourth Fundamental Catalogue (FK4)
Sources
The primary and reference sources this topic draws on.
- IAUInternational Astronomical Union
Official naming, definitions, constellation boundaries, and astronomical nomenclature.