Abstract: We analyse the prospects of a feasible, very long baseline (> 2000 km) neutrino oscillation experiment consisting of a conventional horn produced low energy wide band beam and a 500 kT detector with modest requirements on event recognition and resolution. Such an experiment is intended primarily to measure CP invariance parameters in the neutrino sector; we analyze the sensitivity of such an experiment. The conclusion is that this experiment will allow determination of the CP parameter , if the one currently unknown mixing parameter , a value about 10 times lower than the present experimental upper limit. The experiment has great potential for precise measurements of all parameters in the neutrino mixing matrix including , , , and the mass ordering of neutrino through the observation of the matter effect in the appearance. This experiment could be realized, for example, by building a new conventional neutrino beam at an upgraded 1 MegaWatt Brookhaven National Laboratory-AGS and a new large underground detector at the Homestake mine in South Dakota.