Tag Archives: Astronomy

Jew of the Week: Abenezra

Abenezra’s Commentaries

Avraham ben Meir ibn Ezra (1089 – c. 1167 CE) was a world-renowned scholar born in Tudela, Spain. He became famous at an early age for both his beautiful poetry and philosophical genius. In 1140, ibn Ezra (also known as Abenezra) left Spain and began a fascinating journey that took him across North Africa, to the Holy Land, back through Europe, Italy, France and England. It was during this time that he wrote most of his famous works, including some of the first Hebrew grammar books, and a commentary on the entire Torah and Tanakh. His commentary contained such depth that subsequently many commentaries were written on ibn Ezra’s commentaries! He is famous for his rationalism and logic; in religious matters, too, sometimes even criticizing sacred texts. Not surprisingly, he was also a scholar of mathematics and science, writing several treatises on astronomy, arithmetic and even a manual for using an astrolabe. He is credited with being among the key figures who introduced Europe to the Indian system of mathematical symbols and decimal fractions (still used to this day). Ibn Ezra’s poetry continues to be recited around the world, in both translations and the original Hebrew and Arabic. Among other titles, he has been called “ibn Ezra the Great” and the “Admirable Doctor”. The lunar crater Abenezra is named after him.

 

Words of the Week

Words are the pen of the heart; song is the pen of the soul.
– Rabbi Schneur Zalman of Liadi

Jew of the Week: the Vilna Gaon

Genius Is His Middle Name

the Vilna Gaon

Eliyahu ben Shlomo Zalman Kramer (1720-1797) was born in a small village in what is now Belarus. Known popularly as the Vilna Gaon – the Genius from Vilnius – it is said he committed the entire Torah to memory by age 5, and by age 11 the entire Talmud. It wasn’t long before he was one of European Jewry’s greatest legal authorities. A prolific writer, he penned commentaries on the Tanakh, Talmud, Mishnah and many other works (a large number of them Kabbalistic). Dedicating every moment of his life to Torah learning, he generally studied secular subjects only while in the bathroom (where study of Torah is forbidden). It was there that he became an expert in astronomy and Euclidean geometry, later instructing his disciples to write a mathematical treatise called Ayil Meshulash. The Vilna Gaon led a simple, saintly, ascetic lifestyle, sleeping just 2 hours a day, usually in 4 half-hour segments. For much of his life he was a travelling nomad, though his aim was always to settle in Israel. Himself unable to accomplish this goal, at least three groups of his students and their families did succeed in making Aliyah, bringing over 500 people to Tzfat and Jerusalem long before the Zionist movement. The Vilna Gaon passed away on Tishrei 19, the 5th day of Sukkot.

Psalm of the Day on the day of Gilad Schalit’s release from captivity. Incredibly, the psalm explicitly mentions Gilad’s name, as well as freedom from captivity, the holiday of Sukkot, and Tuesday. Schalit was freed on Tuesday, during the holiday of Sukkot!

Words of the Week

“On Simchat Torah the Torah scrolls wish to dance, so we become their feet.”
– Chassidic saying

Jew of the Week: Carl Sagan

A Beloved Scientist

Carl Sagan

Carl Sagan (1934-1996) Born to Russian-Jewish immigrants in Brooklyn, Sagan went on to become one of the greatest and most beloved scientists of the last century. He published more than 600 scientific papers and at least 20 books, one of which was the novel Contact, since adapted to a Hollywood blockbuster. He is most famous for being the host of the popular 1980s TV show Cosmos. Sagan had degrees in physics, astrophysics and astronomy, lectured at Harvard and was a full-time professor at Cornell. One of the central figures at NASA, Sagan helped develop many space missions, and designed the famous golden plaque launched with most space crafts. When asked if he was an atheist, Sagan replied “An atheist has to know a lot more than I know. An atheist is someone who knows there is no god. By some definitions, atheism is very stupid.”

Words of the Week

“How great are Your works, Hashem, how deep are Your thoughts… How abundant are Your creations; with wisdom You made them all…”
– King David (Psalms)