Among al-Biruni's fields of research in the 1000s were:
How the earth spins on its axis
How wells and springs transport water to the surface
Combining statics and dynamics into the study of mechanics
Recording the latitude and longitude of thousands of cities, which allowed him to determine the direction towards Makkah for each city
The optical nature of shadows, particularly their use for the calculation of prayer times
Separating scientific astronomy from superstitious astrology