  The Light-Time Effect (LTE) is observed whenever the distance between the
observer and any kind of periodic event changes in time. The usual cause of
this distance change is the reflex motion about the system's barycenter due to
the gravitational influence of one or more additional bodies. We analyze 5032
eclipsing contact (EC) and detached (ED) binaries from the All Sky Automated
Survey (ASAS) catalogue to detect variations in the times of eclipses which
possible can be due to the LTE effect. To this end we use an approach known
from the radio pulsar timing where a template radio pulse of a pulsar is used
as a reference to measure the times of arrivals of the collected pulses. In our
analysis as a template for a photometric time series from ASAS, we use a
best-fitting trigonometric series representing the light curve of a given EC or
ED. Subsequently, an O-C diagram is built by comparing the template light curve
with light curves obtained from subsets of a given time series. Most of the
variations we detected in O-Cs correspond to a linear period change. Three show
evidence of more than one complete LTE-orbit. For these objects we obtained
preliminary orbital solutions. Our results demonstrate that the timing analysis
employed in radio pulsar timing can be effectively used to study large data
sets from photometric surveys.
