NavList:

Linked hereto, find the next version of the Virtual Octant.

In this version (provided both .xls and .xlsx) we can compare the parallel path model with the version in which the optical path from the foresight horizon mirror and the backsight horizon mirror strike the index mirror in the same spot.

Just as George points out, we must ‘nod’ the octant to measure the angle. I have provided the measured angle for all four cases, which are:
1) Foresight Angle, Horizon to Object, parallel path model
2) Foresight Angle, Horizon to Object, nodded path model
3) Backsight Angle, Horizon to Object, parallel path model
4) Backsight Angle, Horizon to Object, nodded path model

As usual, you can experiment with alternate mirror arrangements & etc.

Best Regards
Brad

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