Welcome to Astrodynamics and Control Laboratory (ACL) in the Department of Astronomy at Yonsei University. ACL engages in cutting-edge research projects which include Space Launch Vehicle, Orbit Control and Determination, Mission Analysis, and Formation Flying; Ground Control System, and which also cover Attitude Control and Determination; Satellite Techniques. Recently, ACL augmented its research area toward Image Processing form satellites, Advanced Automatic Navigation System using GPS and Orbit Design Techniques for Interplanetary Mission. ACL cultivates competent persons leading the Space Industrial by furnishing a system regarding all the software techniques in the orbits of the space vehicle.