Rising & Setting time of a star on a specific date Given the local sidereal time (LST) of a star when it rises, how can I find out the time when it will rise (according to my watch) on a specific date?
You'll need to convert local sidereal time to local time on the specific date, using the longitude of your location. This can be done with the formula described here:


  $$
UT = \frac{LST - \frac{L}{15} - 6.697374558 - 2400.051336*T - 0.000025862*T^2)}{1.0027379093}
$$
  
  where $UT$ is the time in Universal Coordinated Time, $LST$ is the Local Sidereal Time, $L$ is the longitude, and $T$ is:
  
  $$
T = \frac{JD-2451545.0}{36525.0}
$$
  where JD is the Julian Date at noon UTC.  Once I've calculated the time in UT, I then add or subtract 24 until the result is within 0 - 24 hours.  Then I can convert from UT to local time.