Why isn't Jochanan Jakobson's Yahrzeit Exact?

We do not know the exact date of death of Jochanan Jakobson. According to Jewish tradition, if the exact date of death is not known, the yahrzeit of a person can be observed on any day, as long as it is that same day every year. Since that is the case, we observe the yahrzeit of Jochanan Jakobson on 26 Tammuz. If you know the exact date of death of Jochanan Jakobson, contact us via the contact page. Be sure to include the url: https://eachofushasaname.org/person/2443/Jochanan_Jakobson.html