一张拍摄于1986年的哈雷彗星照片。
张报告说它是一个8.5等的小的彗星，在他的20cm反射镜中占据了3角分的面积。
Zhang described the comet as a small, 8.5- magnitude glow 3 arcminutes across in his 20-cm (8-inch) reflector.
张钰哲致力于观察和计算小行星和彗星的轨道。
He devoted himself to observing and calculating the orbits of minor planets and comets.
张钰哲研究小行星的光变曲线和旋转、CZ仙后座变星以及哈雷彗星轨道的变化。
He studied the light curves of asteroids and thus their rotation, and also studied the variable star CZ Cassiopeiae, and the evolution of the orbit of Comet Halley.
任何运动天体，比如流星，彗星或者行星，(在一组照片中)看起来将会像是从一张照片跳到下一张。
Any moving object, like an asteroid, comet or planet, would appear to jump from one photograph to the next.
任何运动天体，比如流星，彗星或者行星，(在一组照片中)看起来将会像是从一张照片跳到下一张。
Any moving object, like an asteroid, comet or planet, would appear to jump from one photograph to the next.
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