Differential parallax angle 判别视差角度
correction angle due to parallax 位差修正角
Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.
哈雷意识到水星离地球如此之远，以至于很难确定它的视差角。
As Venus was closer to the Earth, its parallax angle would be larger, and Halley worked out that by using Venus it would be possible to measure the Suns distance to 1 part in 500.
由于金星离地球更近，所以它的视差角会更大。哈雷计算出，利用金星可以测量出太阳与地球之间的距离，误差为五百分之一。
SI: With this parallax barrier technology, the LCD must be a certain distance away from the screen. It also needs a certain viewing Angle.
岩田聪：这个视差屏障技术需要要求液晶屏幕必须隔着一定的距离才能实现，同时需要一定的角度才行。
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