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Hi Matt
Do you have access to a 100m long grass paddock? If so, there is a paragraph in the Suiter book that describes how to make an artificial star for testing, but recommends placing it 100m away for optimum results. The pinhole through which the artificial star is observed should be less than 0.3mm dia to ensure it is a point source and not an extended disc.
Ground thermal currents would be something to contend with, even over a paddock.
Cheers
Dennis
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