nth_new_moon
double t0 = nth_new_moon(0);
double tn = nth_new_moon(n);
double t0 = nth_new_moon(0);
double t1 = nth_new_moon(k);
t1 = nth_new_moon(k);
return nth_new_moon(k-1);
double t0 = nth_new_moon(0);
double t1 = nth_new_moon(n);
t1 = nth_new_moon(n);
double nth_new_moon(int n);