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These include for example, estimating the distance to the Moon using a solar eclipse, the size of the Earth by observing the altitude of a star and using lunar eclipses for finding the direction to Mecca. Although lacking important observational technology such as the telescope, those pioneers performed naked eye measurements and implemented simple but ingenious astronomical calculations. The activities are inspired by observations made by the ancient Greeks, Babylonians, Indians and also the medieval Islamic and Chinese astronomers, whose contribution to the development of astronomy was immense. The development of an online platform is presented that incorporates a set of student activities based on the freeware Stellarium planetarium software.
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