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Аннотация:In this paper we report O−C diagrams for 33 RR Lyr type variables. The diagrams
are based on (1) our observations (light curve data and plots are available in the online
version), obtained in 2012 to 2016 with the 0.76-m and 1.0-m telescopes of the South
African Astronomical Observatory (SAAO) equipped with CCDs with B, V , and IC
filters of the Kron-Cousins photometric system (Cousins 1976), (2) the data published by
Berdnikov et al. (2012) and Le Borgne et al. (2007ab, 2008ab, 2009, 2012, 2013), and (3)
the data from NSVS (Wils et al. 2006), ASAS-3 (Pojmanski 2002), Catalina (Drake et al.
2013) , HIPPARCOS (1997), and AAVSO databases. To calculate the O−C residuals we
used the Hertzsprung (1919) method as it was computerized by Berdnikov (1992).