因为1°=60‘ 1’=60‘’ 1°=3600‘’ 所以180°-(67°31‘25’‘+18°19’50‘’)=648000‘’-[(241200‘’+1860‘’+25‘’)+(64800‘’+1140‘’+50‘’)=648000‘’-[243085''+65990'']=648000''-309075''=338925''
=179°59′60″-85°50′75″=179°59′60″-85°51′15″=94°8′45″
同解