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Hello Frank,

You have right, I had skipped a step : I had considered only the table I and II of NA 1767 and the formulas giving the main correction of parallax, and omitted the table IV giving the quadratic term (as Table XXXV of Norie).

Thank you for your explanation about the three terms of quadratic correction ; if my understanding is correct, we take in account only the first term, the others terms are negligible.

A little question again : I suppose that que "quadratic term" lies in the fact that, for calculate the main corrections, we take in account plane triangle, and not spherical triangle : is it true ?

Have a nice evening

Jacques

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