PASTE IT

If we were trying to see a planet the size of Jupiter (radius 71,492 km) transit a star the size of the Sun (6.95508×108 m, or 695,508 km), we would see the dimmed star brightness as 1 − (71, 492/699, 508)2 = 1 − 0.10222 = 1 − 0.01045 = 0.9895

The term refers to a state of mind that is completely empty and void. It originates from the book Zhuangzi, in which the meaning of the term was explained by Confucius to Yan Hui. Zhuangzi believed that one’s ears and heart distinguish between oneself and others and between right and wrong, while qi (气 vital force), shapeless and empty, exists in everything and does not comeinto conflict with anything. Therefore, one’s mind should be empty like qi when coming into contact with external things so that one will not be different or clash with them. When one’s mind roams beyond physical things, freeing itself from the constraints and influence of other things, it maintains a state known as the “pure state of mind.”

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