[poider (Peter)]

Strange question but I am curious to know what people consider to be the minimum distance between tripod feet?
I currently have pavers set in the backyard that have holes drilled for my tripod, the holes are set in a triangle that is 1.5m x 1.5m x 1.5m.
If I set the tripod at 1m x 1m x 1m it is perfect for my eye height but I am worried it will be too unstable for my scope and Camera set up, so is there a formula or a dimension that is too unstable?
Thank you
Peter