Science. 1967 Oct 6;158(3797):114-6. doi: 10.1126/science.158.3797.114.
Optical observations of Venus have yielded various values of the rotation period extending from less than one to several hundred days. Radar observations give a retrograde rotation of the solid globe in 244 +/- 2 days. Recent ultraviolet photographs, however, show relatively rapid displacements of clouds in the high atmosphere of Venus which suggest a retrogrode rotation in only 5 days. The two rates seem to be physically incompatible.
金星的光学观测给出了自转周期的各种数值，从不到一天到几百天不等。雷达观测表明金星固体球体的逆行自转周期为 244 ± 2 天。然而，最近的紫外照片显示金星高层大气中的云团相对较快地移动，这表明金星的自转周期只有 5 天，呈逆行旋转。这两个速率似乎在物理上是不相容的。
