  The ExoClock project is an inclusive, integrated, and interactive platform
that was developed to monitor the ephemerides of the Ariel targets to increase
the mission efficiency. The project makes the best use of all available
resources, i.e., observations from ground telescopes, mid-time values from the
literature and finally, observations from space instruments. Currently, the
ExoClock network includes 280 participants with telescopes capable of observing
85\% of the currently known Ariel candidate targets. This work includes the
results of $\sim$1600 observations obtained up to the 31st of December 2020
from the ExoClock network. These data in combination with $\sim$2350 mid-time
values collected from the literature are used to update the ephemerides of 180
planets. The analysis shows that 40\% of the updated ephemerides will have an
impact on future scheduling as either they have a significantly improved
precision, or they have revealed biases in the old ephemerides. With the new
observations, the observing coverage and rate for half of the planets in the
sample has been doubled or more. Finally, from a population perspective, we
identify that the differences in the 2028 predictions between the old and the
new ephemerides have an STD that is double what is expected from gaussian
uncertainties. These findings have implications for planning future
observations, where we will need to account for drifts potentially greater than
the prediction uncertainties. The updated ephemerides are open and accessible
to the wider exoplanet community both from our Open Science Framework (OSF)
repository and our website.
