Famous charts are useful because the life is already visible. You can view planet positions at the reported birth time. You need a verified birth time for house readings. Naksham uses the same Kundali engine here that powers your own birth-chart tool.
Birth times are the honest hard part. Public figures often have more than one circulated time, and old charts can require historical timezone care. Each page shows the birth-data note before the analysis, so you know whether the record is reported or disputed.
Read these charts as teaching examples, then see your own kundali the same way with your date, time, and place of birth.