Ah, but my Computations, People say,

Reduced the Year to better reckoning?

—Nay, ′T was only striking from the Calender

Unborn To-morrow and dead Yesterday.

                                                 Rubaiyat LVII

啊！別人豈不說我的修曆使歲月好算？

不，唯有將未降生的明日，
已逝去的昨天從曆書上消除，
歲月才有改變。
　

奧馬•海亞姆：阿拉伯數學家、天文學家、詩人及哲學家