  We present the latest results of a long-term observational project aimed at
observing, collecting from the literature, and homogenising the light, colour,
and spectral variations of the well-known emission-line Be star V923 Aql. Our
analysis of these parameters confirms that all of the observables exhibit
cyclic changes with variable cycle length between about 1800 and 3000 days, so
far documented for seven consecutive cycles. We show that these variations can
be qualitatively understood within the framework of the model of one-armed
oscillation of the circumstellar disk, with a wave of increased density and
prograde revolution in space. We confirm the binary nature of the object with a
214.716 day period and estimate the probable system properties. We also confirm
the presence of rapid light, and likely also spectral changes. However, we
cannot provide any firm conclusions regarding their nature. A quantitative
modelling study of long-term changes is planned as a follow-up to this work.
