I would like to observe the minima of Beta Persei (Algol), and I have looking for a ephemerides generator for it.
First, I looked the Sky & Telescope generator:
and this is the result:
And then, I have seen the ephemerides in the AASVO page:
The data are not the same. Do you know which are the correct ephemerides? Do you know another site to see the correct ephemerides?