This star birthday calculator finds the day your birth star returns in your birth month, worked out from the sunrise of the city you choose. For a Kerala (Malayalam) star birthday it applies the reported rule and computes every variant the sources leave open, so when they disagree you see each date with the rules behind it. For Tamil it lists every day the star falls in the month. It can also find your birth star and month from your birth details.
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The place you live now. Sunrise there decides the day. The tool also shows the date computed for Thiruvananthapuram, side by side.
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astrology| What this answers | The day your birth star returns in your birth month, for the next birthday or a year you choose |
|---|---|
| Traditions | Kerala (date computed) and Tamil (star days listed); Telugu and Kannada lunar calendars not covered |
| Kerala month start | The sankranti's day if it comes before three-fifths of that day's daylight, else the next day |
| Tamil month start | The sankranti's day if it comes before sunset, else the next day |
| Kerala day rule | The star holds 6 nazhika (144 minutes) after sunrise, or a tenth of its span; else the day before |
| Star twice in a month | The second counts, unless the next month's sankranti touches it |
| Rule candidates | 16 combinations; results use every combination retained by the reference calendar checks |
| Results | One date; provisional (one date resting on an open point); or every date where the rules differ |
| Positions | Sidereal, Lahiri ayanamsa; a star is the Moon's 13 degree 20 minute segment |
| Day | Sunrise to sunrise at your place; sunrise is the Sun's upper edge with standard refraction |
| Timing margins | Star changes 2.23 min, sunrise 1.54 min, sankranti 15.2 min |
| Range | Births from mid-January 1900; star birthdays up to 31 December 2031 |
Many families in Kerala and Tamil Nadu keep a birthday by the birth star, the nakshatra the Moon was in at birth, rather than by the English date. In Malayalam the birthday is the pirannal. The day is the one in your birth month, the solar month you were born in, on which the Moon returns to your birth star, and it is the day families choose for a temple offering or a family celebration.
The Moon comes back to the same star about every 27.3 days, while a solar month lasts 29 to 32 days. So the star birthday lands on a different English date each year, and in some years the star falls twice in the birth month. Which of the two counts, and which day a star belongs to when it begins after sunrise, are what the rules below decide.
Sources differ on two points: 6 nazhika or a tenth of the span, and whether "touches" means the sankranti falls inside the second star or on its day. On a third, which month a star belongs to when it falls across the start or end of a month, no source we found says anything. This tool adopts, for its first reading, that a star belongs to the month its day falls in, and it computes the three other readings as well. With two thresholds, two readings of the exception and four of month ownership, that is 16 combinations, and every case is worked out under all of them.
Each result carries one of three labels. One date: every combination gives the same day. Provisional: they all give the same day, but it rests on a point the sources leave open, which the result names. Rules differ: the combinations give different days, and each day is shown with the combinations that give it.
The Kerala sources we found agree that the second occurrence is the birthday, with one exception: when the next month's sankranti touches it, the first is kept. The Manorama article reads "touches" as the sankranti falling within the second star; Kalakaumudi and Webdunia read it as falling on the second star's day. The two readings disagree only when the sankranti comes on that day but outside the star, and when that happens this tool shows both dates rather than choosing.
Open "Why this date" under any date to see which combinations give it, which occurrence it is and when the star begins and ends at your place. "Show the star's days in this month" lists every civil day the star touches, with the sunrise, how long after sunrise the star ends and how long it holds that day, in nazhika and vinazhika: 1 nazhika is 24 minutes and 1 vinazhika is 24 seconds.
Our own timing carries a margin: 2.23 minutes for a change of star, 1.54 minutes for sunrise and sunset, and 15.2 minutes for the Sun's change of sign. Each was set by checking our times against published panchang times at Thiruvananthapuram and Chennai, then confirmed on other years at Kozhikode and Madurai. When a decision falls inside that margin, the tool carries both outcomes. A remembered birth time is given a minute either side as well.
Before release, the star days this tool gives were compared both ways with published calendars' daily pages: every day from January 2026 to January 2028 at Thiruvananthapuram (24 Malayalam months) and four Tamil months at Chennai. Every star day the calendars list, this tool lists too; the few days it lists that they do not are all days it marks as uncertain.
Sunrise decides which day a star counts for, so the day can change with the place. The tool shows the date computed for where you live now beside the date computed for Thiruvananthapuram (Kerala) or Chennai (Tamil Nadu) with the same method. The general sources favour the calendar of the place you live in. If a temple is booking an offering for you, ask which date its calendar uses.
A birth time is read on the clock of the birthplace's time zone as it was on that date, including summer time. If the clocks went back that night, the time happened twice and both are kept; if the clocks went forward past it, the time never existed, and the tool says so instead of guessing.
Indian records need care before 1947: before 1906 local towns kept local mean time or Madras time, and during the Second World War the clocks ran an hour ahead. If an old record's time may follow a different clock, check how it was written down before relying on a birth near a change of star.
Kerala - the date is computed, under the rule above. Tamil - the month is computed by the sunset rule, but Tamil sources differ on which day of the star counts, so every day the star touches is listed with its times; some sources recommend the second occurrence. Telugu and Kannada nakshatra birthdays are not covered by this tool.
Looking for which star you were born under rather than the day it returns? The birth star calculator answers that, with the star's names in Malayalam, Tamil and Telugu. For any single day's star, tithi and sunrise, see the panchang.
A birthday kept by the birth star (nakshatra) instead of the English date: the day in your birth month when the Moon returns to the star it was in when you were born. Because the Moon's cycle and the solar months do not line up, it falls on a different English date every year. In Malayalam the birthday is the pirannal, and Kerala families keep it by star; Tamil families keep a star birthday too.
Choose your tradition, Kerala or Tamil, and the city where you will keep the day. If you know your birth star and birth month, pick them; if not, enter your date, time and place of birth and the tool works them out. It then finds the day in that month your star counts for: in Kerala, the day the star holds about 6 nazhika after sunrise, by the rule this tool adopts, with the reasoning shown for each date; in Tamil, every day the star falls in the month is listed.
It moves every year, because the Moon returns to your star on a different day of the solar month each time. Pick your star and month, or enter your birth details, and leave the year on "The next star birthday": the tool shows up to three upcoming month cycles for each possibility in your city, with Thiruvananthapuram or Chennai beside it when you live elsewhere. To see a particular month cycle, choose the year that month starts; a December month can include dates in January of the following year. Results stop at 31 December 2031.
In the Malayalam month you were born in, the tool finds the day your birth star returns. The star counts for a day only if it holds about 6 nazhika (144 minutes) after that day's sunrise, or a tenth of its span, otherwise the previous day counts. If the star falls twice in the month the second is kept, unless the next month's sankranti touches it. This is the rule reported by Malayala Manorama and other Kerala sources, which this tool adopts; where sources differ, it computes every variant.
A solar month runs 29 to 32 days and the Moon returns to a star about every 27.3 days, so a star can fall twice in one month. The Kerala rule this tool adopts keeps the second, unless the next month's sankranti touches it, and then the first. Sources differ on whether that means the sankranti falls inside the second star or on its day, so the tool computes both and tells you when they give different dates.
Because the rules it models do not always agree. Kerala sources differ on the 6-nazhika or one-tenth threshold and on how the sankranti exception reads, and no source we found settles which month a star belongs to when it falls across the start of a month. When those readings give different dates, every date is listed with the rules that give it, instead of one picked silently. When they all agree, you get one date.
Usually the calendar month of your birth date. But a birth between the Sun moving into the next sign and the sunrise that begins the new month has two readings: the calendar month and the Sun's sign at birth. The sources we found do not say which one families use, so the tool shows both. If you already know your Malayalam or Tamil birth month, choose it directly instead.
The tool shows two dates side by side: one computed from the sunrise where you live now, and one computed for Thiruvananthapuram (Kerala) or Chennai (Tamil Nadu). The general sources favour the calendar of the place you live in. The two can differ by a day because sunrise differs. If a temple is booking an offering for you, ask which date its calendar uses.
Not for the day itself. The Tamil month starts on the day of the sankranti if it comes before sunset, otherwise the next day. Tamil sources differ on which day of the star counts, so the tool lists every day the star touches in the month, with its times, and does not choose one. Some sources recommend the second occurrence.
Calendars can use a different ayanamsa, sunrise definition or reference place, and a Tamil vakya panchangam can differ by a day from computed positions. A different sunrise definition alone can move sunrise and sunset by a few minutes. This tool uses the Lahiri ayanamsa and the sunrise of the place you choose, taken as the Sun's upper edge with standard refraction. When a time falls within our timing margin of a sunrise or a change of star, it shows both outcomes instead of guessing.
Choose to find your star from your birth details and tick that you do not know the time. The Moon changes star about once a day, so the tool includes every star the Moon touched on your birth date and gives the star birthday for each. If your horoscope names your birth star, choosing it directly is quicker.
Births from mid-January 1900 to today, and star birthdays up to 31 December 2031; a month that runs past that date is not offered. Telugu and Kannada nakshatra birthdays are not covered by this tool.
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