Qual é o sistema de calendário no Camor?

Qual é o sistema de calendário no Camor? São "anos", na verdade, meses? Ou eles renomear o ano todo mês?

It was the summer of the Seventy-seventh Year of Gandolo, Father of Opportunities, Lord of Coin and Commerce
_{Lies of Locke Lamora - Prologue}

The Seventy-seventh Year of Gandolo became the Seventy-seventh Year of Morgante, the City Father, Lord of Noose and Trowel.
_{Lies of Locke Lamora - Prologue}

But the Seventy-seventh Year of Morgante became the Seventy-seventh Year of Sendovani
_{Lies of Locke Lamora - Prologue}

It was the month of Saris in the Seventy-seventh Year of Iono, the end of an unusually dry and cool autumn.
_{Lies of Locke Lamora - Interlude}

“I have Meraggio’s Directory for the current year, Seventy-eighth Year of Aza Guilla, and yet…Tal Verrar…there is no listing for a West Iron Sea Mercantile Combine.”
_{Lies of Locke Lamora - Chapter 13}

^{(ênfase minha)}

Então, qual é o problema aqui? O "setenta e sete anos" é o mesmo ano ou vários anos?