Jindřich Šilhán* Brno Regional Network of Observers, N. Copernicus Observatory and Planetarium,
Kraví Hora 2, CZ-616 00 Brno, Czech Republic
Most amateur data on eclipsing binaries are still obtained by visual methods. The
results of these observations have usually been published as lists of minima timings.
A portion (several percent) of these timings have proven to be false--i.e., they do
not correspond to any eclipse that would really take place in the binary system in
question. These false minima considerably damage the reputation of all data on
eclipsing binaries provided by amateur astronomers. In order to limit the number
of such errors, a new way of organizing visual observations is recommended.