Question
I live in Virginia and am having a problem with a large amount of moss growing where grass should be growing.  We have a lot of hardwoods and pines on the property, but an adequate amount of sunshine for grass.

Answer
Hi Tom, Moss grows when grass dies.  Soil compaction is the main problem, but water competition from the trees and usually a low pH add to the problem.  Grasslands and forests and different ecosystems.  They never exist in nature. Cool season grasses (fescue, bluegrass, etc.) grow through the winter when deciduous trees don't have leaves and it's in full sunlight and the grass stores enough food to survive the shady times.  The more dense the shade under pines, the more difficult to get grass to grow.
Loosen your soil with a tiller or soil aerator and incorporate some organic matter into the soil (leaves, grass clippings) to help keep it loose.  Check your pH.  It should be at 6.5 for good turf.
This won't be a one time job.  Every few years you'll probably have to repeat the process.  Mother Nature will try to return your pasture to woodlands.  Jim