Even though the Hebrews divided the year by lunar months, it was revealed by the Lord that the first month should be in the spring:
Ex 12:1-3 "Now the LORD spoke to Moses and Aaron in the land of Egypt, saying, "This month shall be your beginning of months; it shall be the first month of the year to you. Speak to all the congregation of Israel…"
The Leap Year
As the lunar year consists of 12 months, or 354 days, 8 hours, and 589 parts, it is shorter than the solar year by 10 days, 21 hours, and 204 parts, and so every two or three years the difference is equalized by the addition of a month (intercalary month), following the twelve-month. This Leap Year consists of 383 days, 21 hours, and 589 parts. There were many methods suggested for the equalization of the solar and lunar years, but we will not get into that in this study.