[muletopia (Chris)]

Thanks Stephane,
Indeed when I look in the advanced sequencer instruction within the loop conditions there is a loop condition
"Loop Until Altitude Sets Below" entry, the illustration shows 30 degrees set.
I have a horizon limit set for m Sidereal technology controlled Mesu mount set at 30 degrees.
So if I were to set ,sy,32 degrees in NINA that should stop the collection of star trails.
I am near the Obs during imageing, to rotate the dome and observing just outside so I am not in danger of having an upside down telescope.
I just have to try to set advance sequence loop options.
Chris