of the day

The amount of shift, Einstein calculated, should be 1.75 seconds of arc — a small variation, but one discernible by astronomers of the day... On May 29, 1919... the British astronomer Arthur Eddington found deflections in starlight that almost matched Einstein's prediction. [原译]其偏斜的弧度,据爱因斯坦计算,应当是一点七五秒。这个偏差是很小的,但是却是今天的天文学家可以测量出来的。……1919年5月29日,英国天文学家爱丁顿……发现皇光的偏斜几乎与爱因斯坦的预言完全相符。(书) 将 astronomer of the day 译为“今天的天文学家”似乎与句子内容不符。