Octave changes on guitar

The notes on a guitar change in octave at the C notes on each string. Listed are the scientific pitch notations through fret 12.

The sixth string starts at the second octave (E2) and changes to the third at the 8th fret.
The fifth string starts at the second octave (A2) and changes to the third at the 3rd fret.
The fourth string starts at the third octave (D3) and changes to the fourth at the 10th fret.
The third string starts at the third octave (G3) and changes to the fourth at the 5th fret.
The second string starts at the third octave (B3) and changes to the fourth at the 1st fret.
The first string starts at the fourth octave (E4) and changes to the fifth at the 8th fret.