[jojobas]

Easiest to understand with a flashing + rotating light analogy.

When a rotating, say one turn in 10 seconds, green light is pointing north, a red light flashes.

If you see a green flash 1 second before a red flash, you're on the 36 degree radial.

[platz]

Wouldn't you be on the 324 degree radial

[lisper]

Depends on the direction of rotation which the GP didn’t specify.