I played around with some numbers in the btc charts, and got one very interesting formula for calculating the cycle bottoms. If we take the cycle top, divide it by pi, then multiply by 0.2, next cycle 0.4, next cycle 0.6, next cycle 0.8, we get the cycle bottom. Remains to be seen if the last one holds.
Pi=3,14
Cycle 0- 31,91: pi*0,2= 2,03
Cycle 1- 1240: pi*0,4= 157,88
Chcle 2- 19804: pi*0,6= 3782,28
Cycle 3- 68997: pi*0,8= 17569,94
Pi=3,14
Cycle 0- 31,91: pi*0,2= 2,03
Cycle 1- 1240: pi*0,4= 157,88
Chcle 2- 19804: pi*0,6= 3782,28
Cycle 3- 68997: pi*0,8= 17569,94