I use a similar method depending on cloud cover to the South; as follows
10 sec exposure - star drift?
20 secs - star drift ?
40 secs - star drift ?
60 secs - star drift?
Rowland, when you say 'to the South' do you mean you do all your adjustments to the South? I have a house in the way so I would be very high in the South - my roofline is where achenar was last week (sans clouds)
About 45-50 degrees by guestimate..nothing below that but color bond and timber!
Graham
