Adjacent ratio is a ratio between the frequency of the 2 successive Shrutis.
I worked out the 'Adjacent ratios' between all 22 shrutis and they showed a definite repetitive pattern or a unique formula, with age-old mathematical numbers governing the ratios such as the Pythagoran Limma, and Syntonic Comma.
![palm_ratio_between_shruti](https://22shruti.com/wp-content/uploads/2023/03/palm_ratio_between_shruti.jpg)
Figure shows the definite repetitive pattern of ratios between adjacent shrutis.
Let us take Shadja as that of the middle C in the keyboard, with the ET frequency of 261.6255528 Hz (Obtained by dividing 440 by 1.0594631, by 9 times).
Shrutis are based on 3 Successive or Adjacent Ratios as shown below. (Refer to following tables)
![principle_adjacent_ratios](https://22shruti.com/wp-content/uploads/2023/03/principle_adjacent_ratios.png)
Table shows 3 Principle Adjacent ratios for 22 Shrutis
![code_adjacent_ratios](https://22shruti.com/wp-content/uploads/2023/03/code_adjacent_ratios.png)
Table shows the working of the Code of Adjacent ratios
Thus the cycle of the chain of adjacent ratios:
The sequence is not haphazard, but has a peculiar design !The values of 1, 2, and 3 are those of the Adjacent Ratios 1, 2, and 3 respectively as given above.