"The Big Dipper, when heaven and earth are connected at 14;" Swallows fly south, and a couple fly in the shadow of the moon. "Who wrote these two poems? What kind of person is the author?

Liu Ban was a gifted scholar in the Northern Song Dynasty. Zeng studied Zi Tong Zhi Jian from Sima Guang. On one occasion, Prime Minister Wang Anshi deliberately challenged him and made a couplet for Liu Ban and Liu Xinran to respond. As a result, Wang Anshi appreciated him very much. He said that when Beidou was in the water at 14 o'clock, there were lonely geese in the south building and shadows flying in the middle of the month. The Beidou reflected the water, just for fourteen stars, and the lonely geese flew across the moon, vaguely like Qi Fei. Couplets are ingenious in conception and beautiful in artistic conception. Couplets have six numerals and four locative words, which are not piled up, but won by artistic conception.