A message is given each time when the rejection has been made. Normally this may happen a few times per night and should not be worried about too much, unless rejections appear frequently, which in most cases indicates star drifting close to the edge of the diaphragm. This program provides an easy way of correcting the PC clock drift. This means adopting the PC system clock as the true UT time. The position angle zero-point correction asked can be given zero, and any possible correction found necessary can be made at a later step.
Irrelevant information is replaced with zeroes.
Also the DOS command COPY can be used to collect the data into one file. The weighted averaging procedure uses the inverse square of the estimated error for each observation for weighting. This prevents weights having values larger than the theoretical maximum corresponding to photon noise limit, which could happen if only the least square fits with only eight data points in each observation were relied. If desired, the corrections can also be given from the keyboard, as asked by the program. CPA are best determined from observations of large polarization standard stars.