 New Year begins on the New Moon in May, when the constellation Orion ("siala sungsang") vanishes in the west and the constellation Scorpius ("siala poriama") rises in the east.Porhalaan is divided into 12 months, each contains 30 days.Each month was named by its number, the first month is called simply "first month" or "bulan si pahasada", second month is "bulan si pahadua", etc.