Muhurth is fixed in 2 steps shown as 2 rules tables below.
- Find the days suitable in a month. Select the day. This is based on Month, Day, Nakshatra, Tithi, Yoga, and Karana.
- 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.
After Graha Pravesam some furniture shifting, decoration and other minor pending matters will be completed. After this on a good day you can start actually staying in the new house. Same rule for actual regular production of machines.
Rules Table I
| No. | Good | Avoid |
| 1 | Bharani, Kartika, Thiruvathira, Ayilyam, Pooram, Vishakham, Thrikketta, Pooratam, Poorattati | |
| 2 | Tuesday Sunday | |
| 4 | 4,9,14, amavasya, S8 and K8 1st half of K7, S1 and P15 2nd half of K3,K10 and S11 |
|
| 6 | Month = Adhik, Karkatakam, Kanni, Kumbham |
Rules Table II
| No. | Good | Avoid |
| 3 | Ascendant - Metam, Thulam, Makaram | |
| 5 | One planet in 4 | |
| 7 | Madhyanham | |
| 8 | Sunrise or Sunset + 4 minutes | |
| 9 | Paattu rashi | |
| 10 | Deeksha + 5 days. |