International Virtual Observatory Alliance
This note describes the recommended way to reference the coordinate systems in usage in Astronomy for an accurate specification of spatial and temporal reference frames. It was made in agreement between the VOTable and the Data Models Working Groups.
This is an IVOA Note expressing suggestions from and opinions of the authors.
It is intended to share best practices, possible approaches, or other perspectives on interoperability with the Virtual Observatory. It should not be referenced or otherwise interpreted as a standard specification.