28derajat 19' 32 - 42derajat 39' 47 =

28°19'32" + 42°39'47"
= (28+42)° + (19+39)' + (32+47)"
= 70° 58' 79"
....Ubah detik ke menit...
= 70° 59' 19"

28° 19' 32'' - 42° 39' 47'
= 27° 78' 92'' - 42° 39' 47''
= -15° 39' 45''
= 15° 39' 45''