(108度28分35秒)/5
=(108度(28+35/60)分)/5
=(108度28.5833分)/5
=((108+28.5833/60)度)/5
=(108.47639度)/5
=21.69528度
=21度0.69528*60分
=21度41.71667分
=21度41分(0.71667*60)秒
=21度41分43秒