1. A relationship to indicate the frequency of the occurrene of sunspots and their progressive movements to lower latitudes on the sun.
2. This "law" predicts the variation of sunspot latitudes during a solar cycle and refers to changes in the amount of total solar radiation and its spectral distribution.
3. The tendency of sunspots to appear at the start of the sun's eleven-year sunspot cycle at high solar latitudes, and for later sunspots to appear at successively lower solar latitudes, before starting the next cycle at the higher latitudes again.