Abstract
The reduction of all the available photometry for the Cepheid CC Lyr has allowed its $$O-C$$ diagram spanning a time interval of 124 years to be constructed. The data obtained provide evidence for the existence of large random fluctuations in the period ( $$\varepsilon/P\approx 0.046$$ ). A formal fitting of the $$O-C$$ residuals has made it possible to estimate the rate of secular increase in the period, $$dP/dt=229.3({\pm}{14.8})$$ s yr $${}^{-1}$$ . The pulsation stability test proposed by Lombard and Koen (1993) has confirmed that the increase in the period is real.
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