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976
| 976 • Zhang Sixun, a Chinese astronomer and engineer, employs the use of liquid mercury in order for the escapement mechanism of his astronomical clock to function and for metal parts not to rust by using hydraulics (water) or to freeze in winter. |
1054
Feb 20
Age: 78y
| 1054 • The SN 1054 supernova is recorded by the Chinese, Arab and possibly Native Americans near the star ζ Tauri.Journal of Astronomy, part 9, chapter 56 of Sung History (Sung Shih) first printing, 1340. facsimile on the frontispiece of Misner, Thorne, Wheeler Gravitation, 1973. For 23 days it remains bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952).http://www.nasa.gov/multimedia/imagegallery/image_feature_567.html |