All the examples use clockwise rotation for their phasors, and use phase = 0 at t=0.
A concept that is missing is the relationship between the direction of the unit circle phasors (clockwise or counter-clockwise (or anti-clockwise, depending on where you grew up)) and how this effects the other transforms. For many areas of study, this is the key to understanding why Fourier spans from -Fs/2 to + Fs/2. It describes the direction of the unit circle vector (or the phase relationships between the signals).
If the phasor rotates the other way, the relationship between I & Q changes, and the FFT shows up on the opposite side of the -Fs/2 to +Fs/2 scale. It's just a mathematical way of representing phase. (that's the part that is difficult to digest for some).
In all the examples, including: https://jackschaedler.github.io/circles-sines-signals/dft_introduction.html
All the examples use clockwise rotation for their phasors, and use phase = 0 at t=0.
A concept that is missing is the relationship between the direction of the unit circle phasors (clockwise or counter-clockwise (or anti-clockwise, depending on where you grew up)) and how this effects the other transforms. For many areas of study, this is the key to understanding why Fourier spans from -Fs/2 to + Fs/2. It describes the direction of the unit circle vector (or the phase relationships between the signals).
I will not effect too many things until you get to Euler. https://jackschaedler.github.io/circles-sines-signals/euler.html
If the phasor rotates the other way, the relationship between I & Q changes, and the FFT shows up on the opposite side of the -Fs/2 to +Fs/2 scale. It's just a mathematical way of representing phase. (that's the part that is difficult to digest for some).
Just a suggestion.