Obelisk functioned in much the same manner: the shadow cast on the markers around it allowed the Egyptians to calculate the time. The obelisk also indicated whether it was morning or afternoon, as well as the summer and winter solstices. A third shadow clock, developed. 1500 BC, was in the shape of a bent T-square. It consisted of a long stem with five variable marks and an elevated crossbar which cast a shadow over those marks. Another type of ancient shadow clock consisted of a long stem with five variable marks and an elevated crossbar which cast a shadow over those marks. It was positioned eastward in the morning so that the rising sun cast a shadow over the marks, and was turned west at noon to catch the afternoon shadows. Another type of ancient shadow clock consisted of a long stem with five variable marks and an elevated crossbar which cast a shadow over those marks.
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