Good Nakshatras for Vaastu (out of the 27 in sequence)
1-Ashwini, 4,5,8,12,13-Hasta,14,15,17,18,19,21,22 and 26
Good Paksha is Shukla paksh - waxing period of the moon from Amavas to Poornima
within the Shuklapaksh Good Tithis are 2,3,5-Panchami,6,7,10-Dasham,11-Ekadashi,12,13-Shivratri,15-Poornima
within the Shuklapaksh Good Vars are Somvar, Budhvar, Guruvar, Shukravar and Shanivar
Notes: Avoid digging on Tuesday or Sunday. These are governed by Mars and Sun respectively, which are very Hot planets, and digging is a cooling, water related activity
Notes: The subset of these considerations put together indicates the Auspicious Vaastu Time