Angle of the first point

This angle (C) determines the angular position of the first point on the first meridian, in the plan of the meridian.

This value can be negative. It's included between-360 ° and 360 °.

The value 0 ° value is in fact a point situated in the plan XY of the selected frame.

The value 90 ° is  a point situated on the axis Z of the selected frame.

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