Unaluna is the first month of the year in the Vetus calendar, and consists of five nine-day weeks.

Unaluna begins (astrologically) with the sun in the sign of Columba and ends in the sign of Ferrum. Astronomically speaking, the sun begins in the constellation of Lupus and ends in the constellation of Columba.

Unaluna is Archaic for "first moon," because the months in the Vetus calendar are lunar, and Unaluna marks the first moon phase for the year.

Seasonally, Unaluna is the beginning of winter for those in the northern hemisphere, and the start of summer for those in the southern hemisphere. It is preceded by Octouna and succeeded by Duaeluna.

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