  We discuss the theoretical analysis and interpretation of space-time
separated clock experiments in the context of a space-time varying scalar field
that is non-universally coupled to the standard model fields. If massive, such
a field is a candidate for dark matter and could be detected in laboratory
experiments. We show that space-time separated experiments have the potential
to probe a fundamentally different parameter space from more common co-located
experiments, allowing decorrelation of previously necessarily correlated
parameters. Finally, we describe such a space-time separated clock experiment
currently running at the Paris Observatory, and present some preliminary
results as a proof of principle.
