Local wisdom as a determinant of the season and wind calendar for coastal communities in Jaring Halus Village

The purpose of this research is to describe a local wisdom of jaring halus village coast communities, Secanggang District of Langkat Regency towards the determination of sea time and analysis based on the seasonal and wind calendars according to the experience of community adaptation. The method of this research is a qualitative descriptive by using the adaptation approach described by Steward in the framework of Cultural ecology analysis. The results of this study indicate that weather change is an important indicator of activity. Hence, by revealing the life cycle of the coastal community, it will be known also the general timeframe allocated for work. As a community whose life depends on the tidal cycle of the sea, the life of the fishing community on the East Coast of North Sumatra does make the moon's rotation of the earth as a basis for consideration in recognizing marine phenomena. the community believes that Knowledge of the Arabic calendar or hijri is proven relevant. The relevance is because of the Islamic calendar year calculated based on the circulation of the moon and the position of the moon astronomically that influence the conditions in the ocean. Seasonal changes in coastal and marine ecosystems are identical to the dates of the hijriyah year.