  In this study, we present an analysis of over 34 years of observational data
from CAL 87, an eclipsing supersoft X-ray source. The primary aim of our study,
which combines previously analysed measurements as well as unexplored publicly
available datasets, is to examine the orbital period evolution of CAL 87. After
meticulously and consistently determining the eclipse timings, we constructed
an O$-$C (observed minus calculated) diagram using a total of 38 data points.
Our results provide confirmation of a positive derivative in the system's
orbital period, with a determined value of $\dot{P}=+
8.18\pm1.46\times10^{-11}$ s/s. We observe a noticeable jitter in the eclipse
timings and additionally identify a systematic delay in the X-ray eclipses
compared to those observed in longer wavelengths. We discuss the interplay of
the pertinent factors that could contribute to a positive period derivative and
the inherent variability in the eclipses.
