The angle between the 12:00 (o’clock) position (the direction vertically
upward) and a radial line drawn through the centre of the CVS. The angle
is measured clockwise from the 12:00 position.
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The angle between the 12:00 (o’clock) position (the direction vertically
upward) and a radial line drawn through the centre of the CVS. The angle
is measured clockwise from the 12:00 position.