Sentence:  Now the month of <WSD>Thoth</WSD> was the first of the Egyptian year, because this month begins a new period. 
Meaning of the word marked with <WSD> tags:  The first month of the later ancient Egyptian civil calendar and Coptic calendar, corresponding to the first month of the season of Akhet. Since 25 BCE, when the calendar was reformed to include leap-days, Thoth has been in roughly September.