The digitisation of the Harvard Astronomical Plate Collection will provide the capability for systematic study the sky on 100 year time scales.
We plan to pursue the following avenues of exploration:
Conduct the first long-term temporal variability survey on days to decades time scales
Novae and dwarf novae distributions and populations in the Galaxy
Black hole and neutron star X-ray binaries in outburst: constraining the BH, NS binary populations in the Galaxy
Black hole masses of bright Quasars from long-term variability measures to constrain their characteristic shortest timescales and thus size
Quiescent black holes in galactic nuclei revealed by tidal disruption of a passing field star and resultant optical flare
Unexpected classes of variables or temporal behaviour of known objects: preview of what PanSTARSS and LSST may see in much more detail but on shorter timescales)