Dawn and dusk don't change time that radically in a week do they? Its also a fair rule of thumb as you go further north towards the equator, there is less variation between of dawn and dusk times between the seasons.
NO i'm living in WA now..
i mean for each sections say Margaret river. have the times the sun is supposed to rise and set. so that if i am going to have a long day at work and can know better if it's worth while heading out for a late sesh..
i think it would be handy.
cause i don't always look at my watch and for when the sun goes down.
and while the seasons are changing the sun rise and set times change a bit.. maybe just up date the time week to week..