...$\eta$ Carinae

Based on observations taken at the European Southern Observatory, La Silla, Chile.

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... 40 degrees

The angle ($\delta$) between the major axis of the homunculus (H) and the axis connecting the centres of the rings (R) is: $\cos\delta = (\sin\theta_{\rm H}\sin\theta_{\rm R}+\cos\theta_{\rm H}\cos\theta_{\rm R})\sin i_{\rm H}\sin i_{\rm R}+\cos i_{\rm H}\cos i_{\rm R}$, where i is the inclination and $\theta$ the position angle.

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