What were some things determined by the haan calendar?

First of all, Haan calendar was a natural calendar based on a solar year, and was divided into 18 months of 20 days each, so the other five days called Uayeb that remained did not have names and was considered unlucky. Also, each day of the calendar represent ad the god who protected the person who was born that day, so people usually named their children based on what dates they were born. However, Uayeb calendar was unlucky because children did not have any name or was accepted in community. Into the topic, this natural calendar governed the agriculture seasons of the year and daily activities like planting and harvesting. Hope it help!

Haan calendar governed the agriculture seasons of the year and daily activities like planting and harvesting. Hope it help!