The intriguing page is from lecture notes on astronomy compiled by the monk Magista Wolfgang Astiria before the year 1490. The top panels clearly illustrate the necessary geometry for a lunar. Left and solar eclipse in the Earth-centred tolemic system. At lower left is a diagram of the tolemic view of the solar system with text at the upper right to explain the movement of the planets according to tolemic geocentric model. At the lower right is a chart to calculate the date of Easter Sunday in the Julian calendar. The illustrated manuscript page was found at Historic Melcabi in Austria