I calculated the minimum time. minI CYGZZ 2453673.333 0.001 Hel SSW n=18 (calculated by Nagai) ZZ Cyg JD(hel)=2453673.333 C=2453673.378 E=13797 O-C=-0.045 - 29/Oct/2005 ZZ Cyg (By Mr.Swierczynski) - + | * 11 + * * * | * * + * * | ** * * 12 + * * * * | ** + +-----------------+-----------------+ 19 20 21 (UT)