If you have a thing in your yard that cast a shadow… you can mark the Jesus death shadow. Put a rock in the spot at end of shadow.

Jesus was killed within a time window. The window is described by Jewish ritual meal on that day

You can back the current fake calendar into the date on the Jewish calendar. They mentioned the Jewish day in the Bible.

You can estimate the location of last/long by the historical location where cross was placed.

Using those three things you can convert the time where he died to your location on earth.