... January 9, 17 43.4 9.14 Moon enters umbra . ... of Moon | ... T - universal time ( TDT - UT1 = 66.0 s ); s - the angular distance between the centers of the Moon and the shadow; d - the linear distance between the Moon's center and that of the shadow in terms of the shadow's radius; P - the position angle of the Moon's disk semi-diameter directed towards the shadow's center. n terms of the shadow's radius; P - the position angle of the Moon's disk semi-diameter directed towards the shadow's center. ...