  Imaging and resolved spectroscopy reveal varying environmental conditions in
our dynamic solar system. Many key advances have focused on how these
conditions change over time. Observatory-level commitments to conduct annual
observations of solar system bodies would establish a long-term legacy
chronicling the evolution of dynamic planetary atmospheres, surfaces, and
rings. Science investigations will use these temporal datasets to address
potential biosignatures, circulation and evolution of atmospheres from the edge
of the habitable zone to the ice giants, orbital dynamics and planetary
seismology with ring systems, exchange between components in the planetary
system, and the migration and processing of volatiles on icy bodies, including
Ocean Worlds. The common factor among these diverse investigations is the need
for a very long campaign duration, and temporal sampling at an annual cadence.
