According to the Hindu Panchanga (almanac), a weekday has five organs, namely, Rashi, Tithi (the longitudinal distance between the sun and the moon), Nakhaytra (the asterism of the Moon), the Yoga (the addition of the longitudes of the Sun and Moon divided by 13° 20´) and Karana (half of a tithi). Each of the weekdays is ruled by its lord such as the Sunday is ruled by the Sun; Monday by the moon; Tuesday by the Mars; Wednesday by the Mercury; Thursday by the Jupiter; Friday by the Venus; and Saturday by the Saturn. According to the Indian astrology, besides especial muhurtas, there are certain Yogas that are considered as propitious for auspicious works. These yogas are formed when the five organs of the weekdays synchronize in certain selective forms with a weekday. These are as below: -
No.1: - Siddhi Yoga: - Siddhi is a Hindi word; it means success, accomplishment. So, any good work initiated and setting out for an outbound journey during this siddhi yoga period will pass through smoothly is successful. This yoga occurs with specific combinations of the weekdays and tithis as tabled below: -
| Weekdays | Tithis |
| Tuesday | Jaya (3/8/13/18/23/28) |
| Wednesday | Bhadra (2/7/12/17/22/27) |
| Thursday | Purna (5/10/15/20/25/30) |
| Friday | Nanda (1/6/11/16/21/26) |
| Saturday | Rikcta (4/9/14/19/24/29 |
No.2: -Tithyamrit Yoga: - This yoga is recommended for taking out an outbound journey.
| Weekdays | Tithis |
| Sunday & Monday | Purna (5/10/15/20/25) |
| Tuesday | Bhadra (2/7/12/17/22/27) |
| Wednesday & Saturday | Nanda (1/6/11/16/21/26) |
| Thursday | Jaya (3/8/13/18/23/28) |
| Friday | Rikcta (4/9/14/19/24/29) |
No3: - Amit Yoga: - This yoga is formed in a few selective combinations of the weekdays, tithis and nakshyatra (the asterism of the Moon). This is also a beneficial yoga for an outbound journey and conducting auspicious activities
| Weekdays | Tithis | Nakshyatras |
| Sunday & Tuesday | Nanda (1/6/11/16/21/26) | Adra, Swati, Shatabhishaka, Moola, Kritika, Anuradha, Ashlesha, and Rewati |
| Monday & Friday | Bhadra (2/7/12/17/22/27) | Poorvaphalguni, Uttaraphalguni, Poorvabhadrapada, and Uttarabhadrapada |
| Wednesday | Jaya (3/8/13/18/23/28) | Aswini, Bharani, Mrigashirsha, Pushya, Jyeshta, and Shravana |
| Thursday | Rikcta (4/9/14/19/24/29) | Punarvasu, Magha, Bishakha, Anuradha, Poorvashadha, and Uttarashadha |
| Saturday | Purna (5/10/15/20/25/30) | Rohini, Hasta, and Dhanishtha. |
Especial Note: – The day when both the Siddhi yoga and the Amrit yoga happen to fall on the same day is believed to have a poisonous effect on the new activity initiated. The coinciding of the two auspicious yogas on the same day is believed to yield poisonous effect as the mixture of honey and butter do. So, such a day is incontrovertibly avoided for initiating a new activity.
The End.