Nostéma calendar

The Nostéma calendar is a calendar system used by the Sinyettan Polystellar Alignment. The system is dedicated to numbering years based on the founding of the Alignment.

Etymology
The name "Nostéma" originates from a combination of two words in Sinyettambë. These are nosta, meaning "birthday," and témanda, meaning "alignment."

History
After the first anniversary of the Alignment's founding, the Alignment Council proposed to create a year-numbering system based on the anniversary alongside designating the birthday as a nationwide holiday to accord with the significance of their kind attaining the ambition of interstellar expansion.

The proposal was officiated in 2130, and the calendar was subsequently adopted in 2141 during the Alignment's 50th anniversary.

Usage and calculation
The Sinyettan year of the Alignment's formation 8785 (2085 in Gregorian years) is used as the starting year of the calendar, which is deemed "Nostéma 1," or alternatively "1 NST." Any years after 8791 are given the Nostéma year and its corresponding Sinyettan years in parentheses. The months in the Sinyettan calendar are kept.

To calculate a Nostéma year from a Gregorian, simply subtract 2085 from the latter. Doing it with a Sinyettan year is a different result..