In this paper,smartphone Augmented Reality(AR)and 2D contents were utilized to develop a system called the Real-World Oriented Smartphone AR Learning System(R-WOSARLS)for seasonal constellation observation,which based on planetarium contents in the planetarium of Nagoya City Science Museum for constellation learning.An experiment was conducted to evaluate the usefulness,usability,and users satisfaction of our system.The results show that the R-WOSARLS is effective in improving the observation and learning of students and in enhancing their motivation to pursue seasonal constellation learning.