Problem [Orbiter 2016] Ecliptical frame of reference is wrong

[HVPLamp]

Hi there!

Here is the problem in Orbiter 2016. Obliquity of the ecliptic of the Earth is equal 23.44 degrees (first screenshot).

Orbital inclination of the ISS is 51.59 degrees in equatorial (second screenshot) and that is about right value according to many sources. So expected orbital inclination of the ISS is 75.03 degrees but orbital MFD, which is set in the ecliptical frame of reference, shows us 74.51 degrees (the last screenshot). So, where is the point?

 

[jarmonik]

The difference comes from the fact that the orbital plane of the ISS is tilted in a different direction than Earth. Your asumption of 75.03 would be corrent only if the axial tilt directions were equal, but they are not. The direction of the tilt is presented by LAN parameter.

Edit: The LAN for the Earth's equator should be 179.98 (in ecliptic frame) (Year 2001)