Is there any way to accurately determine the day of a star's heliacal
rising with Starry Night? I'm having some difficulty in determining on
just which day a star first becomes visible just before the Sun rises.
I realize that this is difficult, and possibly somewhat subjective
without further specified criteria, but so many cultures have employed
the heliacal risings/settings of bright stars as time-keeping devices
that it can't be all THAT subjective in real life. (Can't say I've ever
tried to identify in the real world one myself, though.) Any advice for
me out there?
David
<http://cda.mrs.umn.edu/~dac/>
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