English: Graphs of the distance of Comet Swift-Tuttle from Earth in Astronomical Units and gigametres (millions of kilometres) for years 800 BCE to 2500 CE by CMG Lee based on data at http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1994MNRAS.266..305Y&page_ind=10. Approaches in the shaded area are not visible to the unaided eye. The dashed line shows year 2016 (as an approximation for the "current year").
{{Information |Description ={{en|1=Graphs of the distance of Comet Swift-Tuttle from Earth in Astronomical Units and gigametres (millions of kilometres) for years 800 BCE to 2500 CE by CMG Lee based on data at http://articles.adsabs.harvard.edu/cgi-...