you," that Nisan is the new year for months, and they begin to count months from Nisan. The Pirke De-Rabbi Eliezer taught that God created the sun and the moon on the 28th of Elul. The entire Hebrew calendar—years, months, days, nights, seasons, and intercalation—were before God, and God intercalated the years and delivered the calculations to Adam in the Garden of Eden, as can be read, "This is the calculation for the generations of Adam." Adam handed on the tradition to Enoch, who was initiated in the principle of intercalation, as says, "And Enoch walked with God." Enoch passed the principle of intercalation to Noah, who conveyed the tradition to Shem, who conveyed it to Abraham, who conveyed it to Isaac, who conveyed it to Jacob, who conveyed it to Joseph and his brothers. When Joseph and his brothers died, the Israelites ceased to intercalate, as reports, "And Joseph died, and all his brethren, and all that generation." God then revealed the principles of the Hebrew calendar to Moses and Aaron in Egypt, as reports, "And the Lord spoke to Moses and Aaron in the land of Egypt saying, 'This month shall be to you the beginning of months.'" The Pirke De-Rabbi Eliezer deduced from the word "saying" in that God said to Moses and Aaron that until then, the principle of intercalation had been with God, but from then on it was their right to intercalate the year. Thus the Israelites intercalated the year and will until Elijah returns to herald in the Messianic Age. Rav Assi (or others say Rav Havivi) of Hozna'ah deduced from the words, "And it came to pass in the first month of the second year, on the first day of the month," in that the Tabernacle was erected on the first of Nisan. With reference to this, a Tanna taught that the first of Nisan took ten crowns of distinction by virtue of the ten momentous events that occurred on that day. The first of Nisan was: (1) the first day of the Creation (as reported in ), (2) the first day of the princes' offerings (as reported in ), (3) the first day for the priesthood to make the sacrificial offerings (as reported in ), (4) the first day for public sacrifice, (5) the first day for the descent of fire from Heaven (as reported in ), (6) the first for