English: The orbital position and rotation of the planet Venus shown at 10 Earth-day intervals from 0 to 250 days. The position of the point of the surface that was the antisolar point at day zero is indicated by a cross. As a consequence of the slow retrograde rotation of Venus, any given point on Venus has nearly 60 terrestrial days of continuous illumination and an equivalent period of darkness. [Adapted from figure caption and accompanying text on p. 82. Note that the rotation period known at the time the figure was made was 247 ±5 days, vs current value of 243 days.]