This may be difficult for some to ‘wrap’ your head around this .
I know, I ‘struggled’ with this for more than a little while.
Guitar Tonal Center ___
( the Tonal-Center is the ‘Root of the Key, written )
PHRYGIAN: down major a Major 3rd
DORIAN: down a Major 2nd
*Tonal Center #1. ( Root )
LOCRIAN up a minor 2nd
AEOLIAN: up a minor 3rd
MIXOLYDIAN: up a Perfect 4th
LYDIAN: up a Perfect 5th
PHRYGIAN: up a minor 6th
( Down, is towards Guitar Head Stock )
( UP, is towards the Bridge / Tailpiece ).
The ‘tonal center’ can be any 'Note, Pitch, Key,_
·Mode degree intervals remain the same !