Many space agencies plan a lunar missions, including observations in the near lunar space and/or on the surface of the Moon.One of these projects of "I-VLBI" propose to place two landers with radio beacons on the Lunar near side and to launch one or more Orbiters on the Lunar orbit.The difference of the distances between two radio beacons and Earth will be assumed to be measured by the methods of Inverse VLBI: radio-signal from the various radio beacons will be sent to Earth antenna systems using the Orbiter.The estimation of the physicallibration angle accuracy is made for various location and configuration of the radio beacons, which are in polar or equatorial zones of the Moon.