Is the concept "numerology" based on Hindu Scriptures?In particular which Texts give the rules of how to relate the Navagrahas with the numbers?

Question

The order of the Navagrahas is as follows:

Aditya/Surya(Sun)
Soma/Chandra(Moon)
Angaraka/Mangal/Kuja(Mars)
Budha(Mercury)
Brihaspati(Jupiter)
Sukra(Venus)
Sani(Saturn)
Rahu and Ketu.

This order can be found in Vyasa Krutha Navagraha Stotram and similar stotrams and even in the following small prayer dedicated to them :

Soorya souryamadendhurucha padaveem , sanmangalam mangala,¬ Sad budhim cha budho Guruscha kurutham Shukra sukham , sam sani,¬ Rahur bahu balam karothu vipulam Kethukulasyonnathim,¬ Nithyam preethikara bhavanthu bhavatham sarve prasanna Graha

Let sun give me courage , Moon give high position , Mars grant auspiciousness,¬ Let mercury give good brain , Let Jupiter give great numbers , Venus give pleasure ,Sani peace, Rahu give me physical strength and Kethu greatness of our family,¬ And let all the planets be pleased with me and start liking me.¬

So,the most natural way of associating the nine numbers 1,2..to..9 with the Navagrahas is this:

Sun-1,Moon-2,Mars-3,Mercury-4,Jupiter-5,Venus-6,Saturn-7,Rahu-8 and Ketu-9.

But those who are familiar with the subject of Numerology will know that this is not quite the order that is followed .

In numerology they follow this:

Sun-1,Moon-2,Jupiter-3,Rahu-4,Mercury-5,Venus-6,Ketu-7,Saturn-8,Mars-9.

So,quite different from the association given further above.

My Questions-

Which Hindu Scriptures give these rules of Numerology and in particular the rules regarding which number is to be associated with which of the Navagrahas?

Answer 1

First of all this answer does not address the main question which is about Navagraha's relation with the numbers,nor the one which asks about the basis of numerology in Hindu Scriptures.

It only indicates how the relation may have been formed using the Katapayadi system.

And also it indicates that numerology is not quite out of place in hInduism as we can see from this article : Aksharasamkhya Nirdesha(@Kamakotimandali.org)

ambA is worshipped through various mantras. Of these, panchadashI, shuddha ShoDashI, saubhAgya brahmavidyA or saubhAgya panchadashI (ShoDashI) and mahAShoDashI are the most important mantras in most of the dAkShiNAtya shrIvidyA sampradAyas. The number of letters in these mantras is indicated by the names of parAmbA based on katapaya calculations.

Name 1: lalitAmbA

La-3; li-3; tAm-6; bA-3 Total: 3+3+6+3 = 15 -> shuddha panchadashI

Name 2: lalitAmbikA

La-3; li-3; tAm-6; bi-3; kA-1 Total: 3+3+6+3+1= 16 -> shuddha ShoDashI

Name 3: shrIlalitAmbikA

shrI-2; La-3; li-3; tAm-6; bi-3; kA-1 Total: 2+3+3+6+3+1= 18 -> saubhAgya brahmavidyA

Name 4: shrIrAjarAjeshvarI

shrI-2; rA-2; ja-8; rA-2; je-8; shva-4; rI-2 Total: 2+2+8+2+8+4+2 = 28 -> mahAShoDashI

The same can be seen with respect to chaNDI as well. chan-6 and DI-3, thus indicating 6+3=9. On reversing the digits, the mantra denotes the thirty-six tattvas starting from shiva till dharA.