Been into radio for 40+ years and never heard tell of that. Propagation generally follows the sun but even that has exceptions. Early morning I work into Europe which is due east from me. As the day progresses DX shifts towards Africa with the Caribbean coming in late in the day and into the evening. Late at night it shifts towards the Pacific into Australia and New Zealand. If I stay up late enough it shifts towards East Africa sometimes in the wee hours of the morning and occasionally I have worked Europe after supper which would place ME west of them in the same direction that THEIR sun has shifted.