3 ms·only because you'd need to know what time it is to know where south is relative to the sun.by certifiedloud 4y agoonly because you'd need to know what time it is to know where south is relative to the sun.chasd00 4y agodon't you only need to know if the sun is rising or setting? or basically if it's morning or not?PeterisP 4y agoDepending on how accurate you want it to be - every hour the difference between the sun and the south changes by 15 degrees.