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How did ancient Egyptians tell the exact day and night of the summer and the winter solstices, or the equinoxes of spring and autumn? How could they tell the days when the flooding of the River Nile, Egypt’s lifeline, were approaching? How could they note the lunar cycles of the Moon ruling women’s menses? Did they know the approximate distance between the Earth and the Sun? Did they have markings for each passing day on the covering slabs of the Great Pyramid – removed since antiquity? Hungarian architect András Gőczey applied an engineer’s systematic mindset to find the missing pieces of the age-old puzzle. Searching for answers, he built models of the small pyramids east of Khufu’s pyramid and south