R. Eliezer Fishel ben Isaac of Strzyzow was a Russian Talmudist and cabalist. He lived at Strizhov (Strizhovka) in the eighteenth and nineteenth centuries. He was the author of many cabalistic and homiletic works, among them being: "'Olam Eḥad," homilies on the unity of God, Zolkiev; "'Olam Hafuk," explanation of contrasts, Zolkiev; "'Olam Barur," cabalistic homilies, Lemberg; "'Olam ha-Gadol," also called "Midrash li-Ferushim," seventy cabalistic homilies on Gen. xxxiii. 18 (thirty on the spheres and lights, and forty on the Jewish holidays), Zolkiev, 1800. Fürst ("Bibl. Jud." i. 281) and Benjacob ("Oẓar ha-Sefarim," p. 539) ascribe to Eliezer ben Isaac Fischel a work called "Parashat Eliezer," a commentary to "Karnayim," the cabalistic work of Aaron b. Abraham, and to its commentary, the "Dan Yadin" of Samson of Ostropoli, Jitomir, 1805. The present Jewish calendar is lunisolar, the months being reckoned according to the moon and the years according to the sun. A month is the period of time between one conjunction of the moon with the sun and the next. The conjunction of the moon with the sun is the point in time at which the moon is directly between the earth and the sun (but not on the same plane) and is thus invisible. This is known as the מוֹלָד, molad ("birth," from the root ילד). The mean synodic month (or lunation) is 29 days, 12 hours, 44 minutes, and 3⅓ seconds (793 parts (halakim); in the Jewish system the hour is divided into 1,080 parts each of which is 3⅓ seconds). The solar year is 365 days, 48 minutes, and 46 seconds, which means that a solar year exceeds a lunar one (12 months) by about 11 days. The cycles of 12 lunar months must therefore be adjusted to the solar year, because although the Jewish festivals are fixed according to dates in months, they must also be in specific (agricultural) seasons of the year which depend on the tropical solar year. Without any adjustment the festivals would "wander" through the seasons and the "spring" festival (Passover), for example, would be celebrated eventually in winter, and later in summer. The required adjustment is realized by the addition of an extra month (Adar II) in each of seven out of the 19 years that constitute the small (or lunar) cycle of the moon (mahazor katan or mahazor ha-levanah). In 19 years the solar cycle exceeds the lunar by about 209 days, which are approximately 7 months. In Temple times this intercalation was decided upon in the individual years according to agricultural conditions (Tosef., Sanh. 2:2; Sanh. 11b); later, however, it was fixed to be in the years 3, 6, 8, 11, 14, 17, and 19 of the cycle