How many years between Abraham and Isaac?
About 100 years separate them on the chart.
100 years. The chart places Abraham at 1996 BC and Isaac at 1896 BC, so the gap is 100 years. On the radial chart that distance is visible as the arc between the two.
See it in context
A date means more beside its neighbours. The chart puts this answer in place next to everything happening around it — biblical and world history across the same six thousand years.
Now see where it sits
Everything on this page has a place on one 45×37″ chart — and once you can see what came before and after it, it stops being a fact and starts being a story you can follow.