I calculated the minimum time. minI AURZZ 2453816.337 0.001 Hel SSW n=15 (calculated by Nagai) ZZ Aur JD(hel)=2453816.337 C=2453816.325 E=47091 O-C=+0.012 - 21/Mar/2006 ZZ Aur (By Mr.Swierczynski) - 10 + | + | 11 + * * * * * | ** ** + **** * * | 12 + +-----------------+-----------------+ 19 20 21 (UT)