Create (if non-existent) or update observation data base catalogs/npoi/obsbase as a database of star tables from .con or .cha files. File specification can be either through a string array or or a single wildcard, e.g. files '*.cha'. You have to have write permission to this data base file.obsstars[,stars]
Print to screen or return list of stars contained in data base.obsnights[,nights]
Print to screen or return list of nights contained in data base.obsdates,star_char[,dates, scans]
Print to screen or return list of dates and number of scans when star was observed.