>>510989307
You know you can easily tell North-South from a watch during daylight? If you point the hour hand at the Sun, South lies halfway between the hour hand and the 12 hour mark.

That’s because a clock is calibrated to roughly 2:1 ratio with respect to the Sun’s rotation. That is, the Sun takes twelve hours of daylight to make a half circle through the southern sky, while the clock passes a full circle in that same time. Ergo, you’re dividing the distance the hour hand has moved in half to get the physical direction corresponding to noon, which is due South.