Pillar article
Shani Jayanti Falls on Jyeshtha Amavasya
Shani Jayanti is observed on the Amavasya that purnimanta almanacs call Jyeshtha and amanta almanacs call the close of Vaishakha, the new Moon tied to Shani's birth story as the son of Surya and Chhaya. The tithi is one. The civil date changes every year and can differ by city, because the panchang day is the tithi at local sunrise. It is not a transit of Saturn into a sign, and it is not the start of his nineteen-year mahadasha.
One Amavasya, two month names
Amanta months end at the new Moon. Purnimanta months end at the full Moon. The Amavasya that closes amanta Vaishakha is the Amavasya inside purnimanta Jyeshtha. Households in different regions therefore name one fast with two month labels and sometimes argue the date. The argument is the calendar system plus sunrise. India uses Asia/Kolkata with no daylight saving, and Mumbai's sunrise is still not Kolkata's. If the Amavasya tithi ends between those sunrises, the observance can fall on neighboring civil dates. Use the panchang of the city where you will keep the vow. Do not import a headline date from a city you do not live in.
What the day is for
The day belongs to the mythic birth, so Saturday customs gather even when the Amavasya is not a Saturday: a lamp, sesame, and a retelling of Surya and Chhaya. When the Amavasya does fall on Saturday, the weekday lord and the tithi agree and the observance is louder. Shani Trayodashi is a different vow, any Saturday Trayodashi, and should not be merged with the annual Jayanti. Neither vow starts Sade Sati. Sade Sati starts when transit Saturn enters the 12th from your Moon, a personal sky event. Jayanti is a lunar date in the shared calendar. Mixing them makes people think a missed Jayanti has opened a seven-year transit.
Your Saturn is still your Saturn
The festival does not move natal Saturn's house or aspects. If his nineteen-year dasha is running, the day is a natural Saturday-style observance inside that period. If Venus is running, the day is still the festival and your marriage questions still belong to Venus. Jyothish SI casts the personal Saturn. A city panchang casts the Amavasya. Keep both. The birth story is honored once a year. The drishti on the 3rd, 7th, and 10th is honored by the life you live in those houses.
Frequently asked questions
Which tithi is Shani Jayanti?
The Amavasya named Jyeshtha in the purnimanta calendar and treated as the end of Vaishakha in the amanta calendar. Local sunrise picks the civil date.
Is it the same as Shani Trayodashi?
No. Trayodashi is the thirteenth tithi when it falls on Saturday, and it can occur more than once a year. Jayanti is the one annual Amavasya.
Does Jayanti begin Sade Sati?
No. Sade Sati begins when Saturn enters the 12th from your Moon. Jayanti is a festival date, independent of your natal Saturn period.
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D1, D9, D10, dashas, yogas, and transits, the same calculations referenced in this article.