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.
1946年至1948年张钰哲去美国做访问学者，研究变星。
From 1946 to 1948 he once again went to the United States to study variable stars.
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.
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