Evolution of the median location of the descending (top panel) and ascending (bottom panel) nodes for each trail ejected between 1404 BCE and 1986 CE, color coded as a function of the epoch. Empty circles refer to trails ejected prior to 1000 BCE, filled circles to trails ejected between 1000 BCE and 1 CE, and crosses and the plus symbol to trails ejected after 1 CE. Symbols mark the median location with a time step of 70 yr ending in 2020 CE. Most trails have median locations outside the plot by 2020 CE. Particle sizes are 0.1–1 mm.