Mark J. Harasymiw 
Matemáticas en la Luna (Math on the Moon) [PDF ebook] 

The moon is the only celestial body that humans have set foot on. Some of the knowledge we have of the moon involves numbers, including measurements such as diameter and area. Science and math are complementary foci in this engaging volume, full of beautiful photographs, interesting information, and corresponding math problems. Readers will enjoy feeling like astrophysicists as they complete the lunar math missions in this unique volume.