Issachar ben Mordecai ibn Susan

Issachar ben Mordecai ibn Susan ( fl. 1539–1572) ( Hebrew : יששכר בן מרדכי אבן שושן ) was a Jewish mathematician, living in Palestine . In early youth he removed from the Maghreb , perhaps from Fez , to Jerusalem , where he became a pupil of Levi ibn Ḥabib . From there he went to Safed , where, under great hardship, he continued his studies. But his increasing poverty induced him, in 1539, to leave Safed and seek a living elsewhere. At this time he commenced a work on the calendar, giving, among other things, tables which embraced the years 5299-6000 (1539-2240). After his return to Safed he resumed his work on the calendar, in which he was assisted by the dayyan Joshua. It was published at Salonica , in 1564, under the title Tikkun Yissakar. The second edition, under the title Ibbur Shanim (Venice, 1578), is not as rare as the first. The tables in both editions begin with the year of publication. The book also contains, in two appendixes, a treatise on rites (" minhagim ") depending upon the variations in the calendar from year to year, and a treatise on the division of the weekly portions and the hafṭarot according to the ritual of the different congregations.

Issachar ben Mordecai ibn Susan ( fl. 1539–1572) ( Hebrew : יששכר בן מרדכי אבן שושן ) was a Jewish mathematician , living in Ottoman Palestine . At a young age, he moved from Morocco - perhaps from Fes - to Jerusalem , where he became a pupil of Levi ibn Ḥabib . From there he went to Safed , where, under great hardship, he continued his studies. But his increasing poverty induced him, in 1539, to leave Safed and seek a living elsewhere. At this time he commenced a work on the calendar, giving, among other things, tables which embraced the years 5299-6000 (1539-2240). After his return to Safed he resumed his work on the calendar, in which he was assisted by the dayyan Joshua. It was published at Salonica , in 1564, under the title Tikkun Yissakar. The second edition, under the title Ibbur Shanim (Venice, 1578), is not as rare as the first. The tables in both editions begin with the year of publication. The book also contains, in two appendixes, a treatise on rites (" minhagim ") depending upon the variations in the calendar from year to year, and a treatise on the division of the weekly portions and the hafṭarot according to the ritual of the different congregations.

Issachar ben Mordecai ibn Susan ( fl. 1539–1572) ( Hebrew : יששכר בן מרדכי אבן שושן ) was a Jewish mathematician , living in Ottoman Palestine . At a young age, he moved from Morocco —perhaps from Fes —to Jerusalem , where he became a pupil of Levi ibn Ḥabib . From there he went to Safed , where, under great hardship, he continued his studies. But his increasing poverty induced him, in 1539, to leave Safed and seek a living elsewhere. At this time he commenced a work on the calendar, giving, among other things, tables which embraced the years 5299–6000 (1539–2240). After his return to Safed he resumed his work on the calendar, in which he was assisted by the dayyan Joshua. It was published at Salonica , in 1564, under the title Tikkun Yissakar. The second edition, under the title Ibbur Shanim (Venice, 1578), is not as rare as the first. The tables in both editions begin with the year of publication. The book also contains, in two appendixes, a treatise on rites (" minhagim ") depending upon the variations in the calendar from year to year, and a treatise on the division of the weekly portions and the hafṭarot according to the ritual of the different congregations.

Jewish mathematician Issachar ben Mordecai ibn Susan ( Hebrew : יששכר בן מרדכי אבן שושן ; fl. 1539–1572) was a Jewish mathematician who lived in Ottoman Palestine . At a young age, he moved from Morocco —perhaps from Fes —to Jerusalem , where he became a pupil of Levi ibn Ḥabib . From there he went to Safed , where, under great hardship, he continued his studies. But his increasing poverty induced him, in 1539, to leave Safed and seek a living elsewhere. At this time he commenced work on the calendar, giving, among other things, tables which embraced the years 5299–6000 and (1539–2240). After his return to Safed he resumed his work on the calendar, in which he was assisted by the dayan Joshua. It was published at Salonica , in 1564, under the title Tikkun Yissakar. The second edition, under the title Ibbur Shanim (Venice, 1578), is not as rare as the first. The tables in both editions begin with the year of publication. The book also contains, in two appendixes, a treatise on rites (" minhagim ") depending upon the variations in the calendar from year to year, and a treatise on the division of the weekly portions and the hafṭarot according to the ritual of the different congregations.