Humans have always been fascinated by the Sun and the Moon, the cycles of day and night, the lunar month and the seasons marking the solar year. The stars, imagined into constellations, and their movements marking time and helped find direction. Gradually, we learned to understand the heavens. This is the story of a journey from observation to understanding. It is the story of Astronomy.

Horizons is produced by Bibliotheca Alexandrina, and featured on ACMi with permission from Dr. Ismail Serageldin.