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Another approach is to use the existing data and calculations on the spreadsheet.
The Tangent of half the angle subtended by the Moon’s disc (30.3/2 arcmins) = 0.00440698 x 6719 metres (LOS Distance) which gives a value of 29.61 metres which closely matches the Parallax method.
That is, Chris would only have to move ± 30 metres in the appropriate direction for the airplane to skim the limb of the Moon.
Good positioning, timing and shooting Chris!
Cheers
Dennis
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