Taqi al-Din built the Constantinople observatory of Taqi al-Din in 1577, where he carried out observations until 1580. He calculated the eccentricity of the Sun's orbit and the annual motion of the apogee. However, the observatory's primary purpose was almost certainly astrological rather than astronomical, leading to its destruction in 1580 due to the rise of a clerical faction that opposed its use for that purpose. He also experimented with steam power in Ottoman Egypt in 1551, when he described a steam jack driven by a rudimentary steam turbine.