Bill et al
a question has arisen about how Guide calculates
PA, it appears to measure counter-clockwise, but
it has been suggested (to me) PA is more frequently
measured clockwise! but I also see that eg the
double star catalogues (that I looked at) in Guide
match the Guide calculation, so
1) which is preferred?
2) did Guide (Bill :) ever modify a star catalogue
so PA matched Guide output, or I rather assume that
that Bill worked it out so Guide PA matches the
catalogues. do double star catalogues use different
methods?
thanks!