How important is the Gezer Calendar? - VC2-E15-I

The Gezer Almanac.
Language: Hebrew.
Medium: limestone.
Size: 11.1 centimeters long.
7.2 centimeters wide.
Length: 7 lines of writing.
plus margin signature.
Genre: agricultura.
Approximate Date: 925 BCE.
Place of Discovery: Tell el-Jazari.
ancient Gezer 30km Northwest of Jerusalem.
Excavation Director: R. A. S. Macalister.
Date of Discovery: 1908.
Current Location: Syria and Palestine Collection.

Gezer's calendar is the earliest writing that can be considered Hebrew. Some define it as pre-Hebrew, or Hebrew Paleolithic. In my view this would be the Hebrew script, not the current one which is a Persian writing system.
We will study line by line of this calendar, to be able to understand as the people of that time thought.
ירחו אסף ירחו ז
1
two months of harvest, two months of planting.
Here we have the term two months, which is a dualistic form, refers to two periods. What would define two lunar periods, and thus two months.
We will see that these months are respectively From August to September and October to November.