Moon rises when textbook least expects it

An astronomer in Shanghai has voiced his concerns over an exercise in a science textbook that requires primary school students to document their observations of the moon.

In Summer Vacation Life, published by Shanghai Educational Publishing House, first-grade students are required to observe the shape of the moon between 7 pm and 9 pm for 28 consecutive nights.

But Tang Haiming, secretary-general of the Shanghai Astronomical Society, said the task is misleading because the moon rises at a different time every day.