A festival picks one day, so its rule reads the tithi at one fixed time: sunrise, or the rite's window. Some acts are not tied to a day at all. For them the tithi is the one running at that moment. Ahnika Grantham records this as tatkaliki tithih, the tithi of the moment, for several acts, among them an oil bath, a sea bath, cleaning the teeth and marking a birth. For the date itself, the printed almanac of your tradition decides. A book's rule explains a date; it does not overrule the almanac.
☕ A day's tithi, and a moment's tithi
An almanac names each day by the tithi at sunrise. That name holds for the whole day, even after the tithi has ended in the afternoon. It is a label for the day, and festival rules use it, or the tithi at their own window.
Some acts are done at one moment and are not about the day. For these, Ahnika Grantham, Vol. 1 (Sri Ahobila Mutt) records the maxim tatkaliki tithih: the tithi is the one at that moment. Its list includes an oil bath, a sea bath, cleaning the teeth, and marking a birth.
So a child born at 15:00, after the morning's tithi has ended, is born in the next tithi, though the almanac still names the day by the morning's one.
Some festival rites are bound to a moment too. Nirnaya Sindhu places the Naraka Chaturdashi oil bath at moonrise before sunrise, and asks for the Chaturdashi at that time (Nirnaya Sindhu of Kamalakara Bhatta, p. 147).
At a glance
- The day's name in the almanac: the tithi at sunrise.
- A festival's day: the tithi at the festival's own window, then the rule's fallbacks.
- An oil bath, a sea bath, cleaning the teeth, marking a birth: the tithi at that moment.
- A sankalpam names eight facts: year, ayana, ritu, month, paksha, tithi, weekday and star. The list does not say at which moment the tithi is read.
- What Nava does: the birth tithi of a profile or a family member is the tithi at the moment of birth, not at that day's sunrise. Festival days read only the fixed times. For any other moment, the day's panchangam gives the time each tithi ends, so you can see which one is running.
Frequently asked questions
The almanac says today is Ashtami, but Ashtami ended at noon. Which tithi is it now?
Now it is Navami. The almanac names the day by the tithi at sunrise, and that name stays all day. The tithi running at a moment is a separate question.
Which tithi is a child born in?
The one running at the moment of birth. A birth is in the maxim’s list of acts that take the tithi of the moment, not the day’s tithi.
Why don’t festivals use the moment too?
A festival must be one day for everyone in a place, so its rule reads the tithi at one fixed time. A personal act happens once, at its own moment.
Deep dive: one day, two tithis
The same calendar day, read at three moments.
⏱️ Three moments on one day
Ashtami began the evening before. Sunrise 06:10, Ashtami. Ashtami ends at 12:40; Navami follows.
- The almanac's name for the day: Ashtami.
- An oil bath at 05:30 that morning: the tithi at that moment, Ashtami.
- A birth at 15:00: the tithi at that moment, Navami.
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This page builds on kshaya and vriddhi tithis, which shows how a tithi can sit between two sunrises.