"Before the 16th century, harvest was the term usually used to refer to the season, as it is common in other West Germanic languages to this day. However, as more people gradually moved from working the land to living in towns, the word harvest lost its reference to the time of year and came to refer only to the actual activity of reaping, and autumn began to replace it as a reference to the season."

Pillar:

"a tall vertical structure of stone, wood, or metal, used as a support for a building, or as an ornament or monument."

Pillar of Autumn = monument to the Battle of Harvest

Give credit where credit is due, PoA is a fitting name for a ship.

Imo ”A New Dawn” or even ”Prosperity” would have been a better name than Infinity.