  The Cepheid Period-Luminosity law is a key rung on the extragalactic distance
ladder. However, numerous Cepheids are known to undergo period variations.
Monitoring, refining, and understanding these period variations allows us to
better determine the parameters of the Cepheids themselves and of the
instability strip in which they reside, and to test models of stellar
evolution. VZ Cyg, a classical Cepheid pulsating at $\sim$4.864 days, has been
observed for over 100 years. Combining data from literature observations, the
Kilodegree Extremely Little Telescope (KELT) transit survey, and new targeted
observations with the Robotically Controlled Telescope (RCT) at Kitt Peak, we
find a period change rate of $dP/dt = -0.0642 \pm 0.0018$ sec yr$^{-1}$.
However, when only the recent observations are examined, we find a much higher
period change rate of $dP/dt = - 0.0923 \pm 0.0110$ sec yr$^{-1}$. This higher
rate could be due to an apparent long-term (P $\approx$ 26.5 yr) cyclic period
variation. The possible interpretations of this single Cepheid's complex period
variations underscore both the need to regularly monitor pulsating variables,
and the important benefits that photometric surveys such as KELT can have on
the field. Further monitoring of this interesting example of Cepheid
variability is recommended to confirm and better understand the possible cyclic
period variations. Further, Cepheid timing analyses are necessary to fully
understand their current behaviors and parameters, as well as their
evolutionary histories.
