Color online) The meaning of tilting the head by 90 degrees.

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Frontiers Cardiovascular Response to Posture Changes: Multiscale Modeling and in vivo Validation During Head-Up Tilt

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Figure 1 British Journal of Ophthalmology

Jean-Pierre ECKMANN, Professor Emeritus, PhD, University of Geneva, Genève, UNIGE, Department of Theoretical Physics

Definition of Head Tilts and Head Movements

Jean-Pierre ECKMANN, Professor Emeritus, PhD, University of Geneva, Genève, UNIGE, Department of Theoretical Physics

The adequate angle for head position for comfortable reading. Source

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What is blocking the human head from rotating more than 90 degrees in each side? - Quora