Islam is an important topic in human and regional geography instruction, and major textbooks include maps showing Islam's core and rapid expansion diffusion, along with the number of pilgrims to Mecca from different countries. Determining the qibla, the sacred direction for daily prayer, and the distance to Mecca are additional topics that link human geography, Islamic mathematical geography, and modern geographic information science. Recently discovered Persian instruments used a retro-azimuthal map projection devised by medieval Muslim mathematicians to compute the qibla and distance to Mecca from anywhere within the seventeenth century realm of Islam. Modern global maps that allow the qibla and distance to Mecca to be determined from all populated areas on earth are added to the Persian instruments.