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By the numbers one, eight, six, two, seven, six, and twelve original: "eketyaṃ dinnāgarasanetrārdhiśastrasūrya". These numbers correspond to the specific parts of the day on Sunday through Saturday when the Yamaghanta period occurs., the Yamaghanta The "Bell of Death," a period considered highly inauspicious for travel or beginning new ventures. is calculated. It is said to occur in this sequence.
The periods of Kantaka, Kalavela, and Yamaghanta Three distinct types of inauspicious time-segments in Hindu astrology. are generally measured during the day. However, some authorities state they should also be calculated for the night based on the elapsed portions of time. Shripati A renowned 11th-century Indian astronomer and astrologer. says:
The wise should avoid the half-periods (Prahara) starting from the second portion for all auspicious ceremonies. On the days of Mars, Saturn, the Sun, Mercury, the Moon, and Jupiter, these should be shunned.
The period known as Kulika An inauspicious time-segment, similar to Rahu Kaal, often associated with loss or "the lineage-destroyer." is proclaimed by the numbers fourteen, twelve, ten, eight, six, four, and two original: "manvarkadigvasutravedapadaiḥ". These use "Bhuta-sankhya" or object-counting notation where Manu = 14, Arka = 12, etc.. These occur during the day, and also during the night. It is said that in all beautiful works, these periods bring about death. In the Yamaghanta and Kulika periods, there is "Total Destruction" original: "sarvanāśāḥ". of the efforts; however, some say these are not as harmful when they occur at night.
Whenever the sum of the number of the lunar day (Tithi) and the number of the weekday equals thirteen, it creates a combination called Kankacha. This must be avoided in all auspicious works.
Now, the Auspicious Yogas Yoga here refers to a specific planetary/lunar alignment.:
The Siddha yoga is formed by the Sun and Friday. The Bhadra "Prosperous" alignment. is formed by Wednesday and Monday. The Jaya "Victorious" alignment. is formed by Mars and Saturday. The Rikta "Empty" or "Void" – usually inauspicious, but here categorized by specific rules. is assigned to Thursday, while the Purna "Full/Complete." alignment is praised on Jupiter’s day.
Shripati further states:
The Amrita Siddhi Yoga The "Yoga of Attaining the Nectar of Immortality/Success," considered the most powerful time for starting any major life event. occurs during these combinations:
In the "Powerful Heroic" original: "bhīmaparākrame". combinations: the Moon with Mula, the Sun with Pushya, Hasta, or the Uttara constellations, and Wednesday with Mriga. These are the best constellations. On Tuesday and Wednesday, Anuradha and Varuna (Shatabhisha) constellations are excellent. On Thursday, Pushya and Punarvasu are favored. On Friday, Bhaga (Purva Phalguni) and Ashwini or Shravana. On Saturday, Swati and Pitamaha (Rohini). These constellations are indeed the givers of great fortune.
According to the Rajamartanda A significant astrological treatise attributed to King Bhoja of Dhara (11th century).:
For entering a new home, Mars with Ashwini is favored; for beginning a journey, Saturday with Rohini or Jupiter with...