Muhurth is fixed in 2 steps shown as 2 rules tables below.

  1. Find the days suitable in a month.  Select the day. This is based on Month, Day, Nakshatra, Tithi, Yoga, and Karana. 
  2. Find the time of the event. This is based on the horoscope of that moment. What is rising ? What is setting or going to set ? etc.

Select Year and Month for finding suitable muhurth days.

Year       =   Month    =                      


Simantonayana or parting of wife's hair by husband also purifies the fetus. This ceremony is performed by the husband for the wife to protect her from evil spirits and from ill health during the pregnancy.  This Sanskar is performed during the seventh month of pregnancy and prayers are offered for the healthy physical and mental growth of the child. The other importance of this Sanskar is to free the expectant mother free from worries since the last 3 months are very difficult for pregnant woman -- both physically and mentally. On the day of this Sanskar, the expectant mother gets food of her desire. Only women are invited for this ritual and the gathering is kept small The husband performs this ritual.

Rules Table I

No. Good Avoid
1 Nak = 2nd and 3rd  paad of -- Mrgasiras. Pusya, Hast, Uttara, Uttarashada, Uttarabhadrapad, rohini, revati, mula, punarvasu or shravan. Nak = Asvini, Punartham, Pooyam, Attham, Anisham, Thiruvonam, Poorottathi, Uttrattathi
2 Day = Su Mo Tu We Th Fr Sa  [Tu in South India]
3 Tithi = 5,7,10,11,13 [16,17,18,19,20]

In emergency Tithi = 4/8/14/9/6/12

4,9,14, amavasya, and S8 
1st half of K7, S1 and P15
2nd half of K3,K10 and S11

Krishna Paksham full

Tithi = 1,2,3,4,8,6,9,12,14,15,21 to 30.

Rules Table II

No. Good Avoid
4 Shubh Grahas in 1,4,7,10 and 5,9. Ascendant = Simham, Vrichikam 
5 Papa Grahas in 3,6,11 Sayanham. Madhyanham first 10 g
6 Male adhipathi for Lagna and NavamshaLagna Single planet in 8th 
7 6th or 8th month of pregnancy. 
some say 4/5/7/9th month.
Lag in 8th from wife's lagna and rasi
8   Moo in 12/6/8
9   Ulka = Eclipse day. Earthquake day. Meteor Shower day. Animal howling day.