Algol Minima Times
from S&T's Online Calculator
This is a screen capture of the Algol minima calculator from Sky & Telescope online. It shows the upcoming minima for the eclipsing variable star Algol that will be visible from from 40°N-75°W (nominally Philadelphia, PA) highlighted in yellow. Click here for a printable version of the S&T magnitude reference chart. Here's some more info about Algol.