In Ḳabbalistic tradition, the new moon is sanctified seven days after its appearance, under a clear sky, standing facing east. It may be said as early as three days after the new moon, and as late as a day before the full moon (the moon should still be visibly waxing). It is the custom in the month of Av to wait to sanctify the moon until after Tisha b’Av, and in Tishrei to wait until after Yom Kippur. In a minyan, the Aleinu prayer and ḳaddish are traditionally added at the end.