Every April someone writes to me with a screenshot of two calendars open side by side. One says Hanuman Jayanti is today. The other, usually a Tamil or Kannada panchāṅga, says it is nowhere near. The question that follows is always the same, and it is always framed as an accusation against one of the two calendars: which one is wrong?
Neither is wrong. That answer sounds like a dodge, so let me show you the actual machinery underneath it, because once you see it the disagreement stops being confusing and becomes almost obvious.
The date my engine returns for 2027
In the reckoning followed across most of North and West India, Hanuman Jayanti 2027 falls on Tuesday, 20 April 2027. The tithi is Chaitra Śukla Pūrṇimā, the full moon of the month of Chaitra.
That is the only Hanuman Jayanti date I have computed and confirmed against the tithi for 2027, so it is the only one I will state as a date. I will come back to the other reckonings below, and I will be explicit about what I have and have not verified for them.
One detail worth pausing on: in 2027 this lands on a Tuesday. Maṅgalavāra is the weekday classically associated with Hanuman worship in the same way Śanivāra is, so a Chaitra Pūrṇimā that falls on a Tuesday is a pleasing coincidence of calendar and custom. It happens roughly one year in seven and carries no special claim beyond that.
Why a tithi festival can honestly have two dates
A festival anchored to a tithi is anchored to a specific angular relationship between the Sun and the Moon. Pūrṇimā is the tithi during which the Moon is between 168 and 180 degrees ahead of the Sun. That is an astronomical fact and it happens at one instant everywhere on Earth.
The disagreement is never about the astronomy. It is about which festival is being kept. Different regions of India commemorate Hanuman on different tithis entirely, for reasons that are historical and textual, and each region’s tradition is internally consistent. When two calendars disagree, they are usually describing two different observances that share an English name.
This is the single most useful thing to understand about the Indian festival calendar in general. If you want the underlying grammar of tithi, vāra, nakṣatra, yoga and karaṇa that all of this rests on, I have written it out in the five limbs of the panchāṅga.
The Chaitra Pūrṇimā reckoning
The reckoning that gives 20 April 2027 places Hanuman’s appearance on the full moon of Chaitra. This is the dominant tradition in the Hindi belt, Maharashtra, Gujarat and much of the north, and it is the one most national calendars print.
It sits in a busy stretch of the calendar. Chaitra Śukla begins with the new year observances, runs through Rāma Navamī on the ninth tithi, and closes with this Pūrṇimā six days later.
That sequence is not accidental. Placing Hanuman’s day at the end of the same śukla pakṣa that contains Rāma Navamī reads as a deliberate arrangement, with the servant’s day following the master’s within one lunar fortnight.
If you want the start of that fortnight, it is the same new moon that opens the year in the Deccan tradition, covered in Ugādi 2027.
The southern reckonings, and the dates I am not printing
At least two other well documented traditions exist. In Tamil Nadu, Hanuman Jayanti is widely kept in the month of Mārgaśīrṣa, in the Tamil month of Mārgaḻi, on a day fixed by the Moon’s nakṣatra rather than by Pūrṇimā. In parts of Karnataka and Andhra, a Hanuman Vratam is kept in the kṛṣṇa pakṣa of Vaiśākha.
I have not run those through my festival engine for 2027, and the whole point of this site is that I only publish numbers I have actually computed. So: . If you follow one of those traditions, take the date from your family’s own digest, not from a national calendar and not from me.
I would rather leave a gap in a post than fill it with a plausible guess. Three posts on this site went out earlier with festival dates I had not verified line by line, and correcting them was the right call and an unpleasant morning.
The sunrise rule that picks the calendar day
Here is the mechanism that produces most of the remaining confusion, even inside a single tradition.
A tithi is not a day. It is a phase, and it can begin and end at any clock time, because the Moon does not move at a constant angular rate.
A Pūrṇimā might begin at 3 in the afternoon on one date and end at 1 in the afternoon on the next. Now two calendars both following Chaitra Pūrṇimā have to decide which of those two civil dates gets the festival.
The general rule for a Pūrṇimā observance is that the day on which the tithi is current at the relevant time of worship takes the festival. For most jayantī observances that anchor is sunrise, and for others it is the evening.
When a tithi is short and straddles two sunrises, or when it is long enough to touch two, calendars that use slightly different anchors can land one day apart. Both are applying a real rule correctly.
The misreading worth correcting: jayantī as a birth certificate
Most of the “which date is real” argument runs on an assumption nobody states out loud: that there was one historical calendar day, and one of these traditions has preserved it while the others drifted.
That is not how a jayantī works. The word marks a commemoration fixed to a recurring tithi, and the tithi is chosen by the tradition doing the commemorating.
Asking which Hanuman Jayanti is the true one is like asking which of two families keeps the true anniversary when they mark different events. The Chaitra Pūrṇimā tradition and the Mārgaḻi tradition are both complete and both old. Neither is a corruption of the other.
Once you accept that, the practical question stops being “which is correct” and becomes “which does my family keep”, which is a question your family can answer and no calculator can.
A rarely mentioned detail: the month is named after a nakṣatra
Here is something that almost never comes up, and it makes the whole calendar click into place.
The twelve lunar months are named after the nakṣatra in which the full moon of that month falls. Chaitra takes its name from Chitrā. Vaiśākha from Viśākhā. Śrāvaṇa from Śravaṇa. Kārtika from Kṛttikā. Mārgaśīrṣa from Mṛgaśīrṣa.
So when a calendar says Chaitra Pūrṇimā, it is telling you, in the name itself, roughly where the Moon is sitting: in or near Chitrā, with the Sun opposite it in the Aśvinī to Bharaṇī stretch.
The month name is a compressed piece of astronomy. Once you know this, you can sanity check any lunar month claim in about five seconds without opening software, and you will catch a surprising number of calendar errors that way.
How to settle it for your own household
Three questions, in order. Which tradition does your family follow, north Indian Pūrṇimā or a southern reckoning? Which digest does your local temple use? And is the observance in your house a morning one or an evening one, because that decides which sunrise anchor applies when a tithi straddles two days?
Answer those and the ambiguity disappears entirely. It was never a contradiction in the mathematics. It was two traditions and one English name.
What is the date of Hanuman Jayanti in 2027?
In the Chaitra Śukla Pūrṇimā reckoning followed across most of North and West India, it falls on Tuesday, 20 April 2027. Southern traditions that commemorate Hanuman on a different tithi will have a different date, which I have not computed for 2027 and therefore have not printed here.
Why do calendars show two different Hanuman Jayanti dates?
Because they are marking two different observances. The northern tradition anchors to Chaitra Śukla Pūrṇimā, while traditions in Tamil Nadu and parts of Karnataka and Andhra anchor to other months and tithis. Each is internally consistent. The disagreement is about which tradition is being followed, never about the astronomy.
Which Hanuman Jayanti date is the correct one?
Both are correct within their own traditions. A jayantī commemorates on a tithi chosen by the tradition keeping it, so there is no single historical calendar day that one region preserved and others lost. The practical answer is whichever date your family and your local temple keep.
Why does Hanuman Jayanti sometimes shift by one day even within the same tradition?
A tithi begins and ends at arbitrary clock times, so a Pūrṇimā can straddle two sunrises or fall between them. Calendars that anchor to slightly different moments of observance, sunrise for some observances and evening for others, can land one civil day apart while both apply a valid rule.
Is there any astrological significance to Hanuman Jayanti falling on a Tuesday in 2027?
Maṅgalavāra is the weekday conventionally associated with Hanuman worship, so the alignment is pleasing to people who keep the day. It carries no predictive weight. A tithi festival lands on whatever weekday the calendar produces, and roughly one year in seven it will be a Tuesday.
How is the lunar month Chaitra named?
From the nakṣatra Chitrā, because the full moon of that month falls in or near Chitrā. Every lunar month follows the same convention, which is why Vaiśākha pairs with Viśākhā and Kārtika with Kṛttikā. The month name is effectively a statement about where the Moon sits at Pūrṇimā.
Comments
No comments yet. Yours would be the first.
Leave a comment
Held for review before it appears. Your email is never published.