Observatory, Mount Holyoke College, South Hadley, MA 01075
at the 91st Annual Meeting of the AAVSO, October 26, 2002
Abstract Comparison star magnitude sequences on older AAVSO
charts come from various sources and often differ from magnitudes in the modern
V system. Archived variable star data in the AAVSO International
Database can be transformed by various algorithms. The transformed observations
can be better combined with modern observations.