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See rotation angle W definedefined in heading picture at https://astrogeology.usgs.gov/groups/IAU-WGCCRE
With $\alpha_0=0°$, $\delta_0=90°$, W should be "RA of meridian" - ( 90° + $\alpha_0$ ) = ~ 280° - 90° = ~ 190°.
See rotation angle W define in heading picture at https://astrogeology.usgs.gov/groups/IAU-WGCCRE
With $\alpha_0=0°$, $\delta_0=90°$, W should be "RA of meridian" - 90° + $\alpha_0$ = ~ 280° - 90° = ~ 190°.
See rotation angle W defined in heading picture at https://astrogeology.usgs.gov/groups/IAU-WGCCRE
With alpha0=0$\alpha_0=0°$, delta0=90$\delta_0=90°$, W should be "RA of meridian" - "9090° + alpha0"$\alpha_0$ = ~ 280280° - 9090° = ~ 190190°.
With alpha0=0, delta0=90, W should be "RA of meridian" - "90 + alpha0" = ~ 280 - 90 = ~ 190.
