The perturbing effects of solar radiation pressure on a satellite orbit are studied by examining a progression of simplified mathematical models. The first-order variation of radial distance is generated for each model to exhibit the basic phenomenon as well as seasonal and shadow effects. The technique used is adequate for the cases examined but rapidly becomes unwieldy if greater accuracy is required or if the models become significantly more complex. Surprisingly good agreement is noted with previous theoretical results (and hence with observation). Although unsuited for precision orbit computation, the methods employed yield fresh insight into the fundamental mechanics of this perturbation and illustrate, in a simple way, the major effects on earth satellite orbits.