Review In last lecture we looked at conventional methods of measuring coordinates Triangulation, trilateration, and leveling Astronomic measurements using external bodies Gravity field enters in these determinations 02/1302 12.540Lec0302/13/02 12.540 Lec 03 2 Review • In last lecture we looked at conventional methods of measuring coordinates • Triangulation, trilateration, and leveling • Astronomic measurements using external bodies • Gravity field enters in these determinations