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Edit: Not a duplicate, the other question asking how the naming is done, my question is asking how the nakshatras were selected for naming months, the filtering rationale of left out nakshatras and how to decide the month. These are not the same questions.

Moon takes approx 27 days to orbit Earth once, so the Sky was divided into 27 Nakshatras or Lunar Mansions, and were named.

There are approximately 12 Full Moons in 1 year, so the year was divided into 12 Months. But when naming them, they used the Nakshatra names.

But there are 27 nakshatras and only 12 months, so out of 27, 15 nakshatras were taken, 9 single nakshatras and 6 nakshatras in Purva-Uttara pairs. 12 Nakshatras were left out.

And the names of the month were based on the nakshatras which are in bold in the following list.

1.Ashwini
2.Bharani
3.Krittika
4.Rohini
5.Mrigashira
6.Ardra
7.Punarvasu
8.Pushya
9.Ashlesha
10.Magha
11.Purva Phalguni
12.Uttara Phalguni
13.Hasta
14.Chitra
15.Swati
16.Vishaka
17.Anurada
18.Jyeshta
19.Mula
20.Purva Ashadha
21.Uttara Ashadha
22.Shravana
23.Dhanishta
24.Shatabhishak
25.Purva Bhadrapada
26.Uttara Bhadrapada
27.Revati


The idea may have been, near whichever Nakshatra the full Moon occurs, that name will be the month's name.

My question is on what basis were these Nakshatras selected out for naming? There is some opinion that which ever Nakshatra the full moon would likely occur, that name is given. But full moon occurs also in the left out Nakshatras, with equal probability. So that theory is wrong.

One would expect atleast the list to be alternative or of having some pattern. But it is not alternatives and there seems to be no pattern. So how was the naming done?

Moreover how do you decide which month it is based on the position of Full Moon? Are there details about this given in Vedas, Upanishads, Ramayana or Mahabharata or Jyothisha books like Vedanga Jyothisha?

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  • Who ever has closed it is not a duplicate reopen the question. Jun 28, 2022 at 4:55
  • @Vivikta did you close this as a duplicate? Jun 28, 2022 at 4:58
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    No, I didn't , I just edited your question. @Optimus :)
    – Vivikta
    Jun 28, 2022 at 5:20
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    @Optimus i closed. it's a clear duplicate.
    – The Destroyer
    Jun 28, 2022 at 5:34
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    @TheDestroyer can you explain how it's a duplicate. Can't you see the difference between naming of the months vs selecting of which stars to name the months also as to decide which lunar month it is based on full moon? Jun 28, 2022 at 6:12

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