sine, cosine transformed cyclical features - am I losing information?
Are 0 and 23 supposed to be the same?
If not then you should use $( \sin(2i\pi/24),\cos(2i\pi/24) )$ instead of $( \sin(2i\pi/23),\cos(2i\pi/23) )$ with $i \in \{0,...,23\}$