1°=60′=3600″
12°23′42″
=12°+(23/60)°+(42/3600)°
=12°+(23/60)°+(7/600)°
=12°+(230/600)°+(7/600)°
=12°+(237/600)°
=12°+0.395°
=12.395°
26°12′18″
=26°+(12/60)°+(18/600)°
=26°+0.2°+0.03°
=26.23°