Zocht je misschien: celesta?
Learning about circular motion of celestial bodies with interactive qualitative representations
Kragten, Marco; Bredeweg, Bert; Wang, Ning; Rebolledo-Mendez, Genaro; Dimitrova, Vania; Matsuda, Noboru; Santos, Olga C.
Integrating custom environment and nighttime effects into NAUTIS
Mazek, N (Nico) (Student)