What Are Astrology Points in Olden Era?

Quick answer

Astrology points in Olden Era is a new progression system that provides active neutral spells to improve your movement and map scouting.

Yes, all players independent of their skill level and experience must use Astrology points. This is a key factor to succeed in campaign, quick matches against AI bots and online pvp multiplayer.

Astrology has a progress bar
As soon as you reach a Astrology points threshold u receive 1 Astrology insight. (For example your daily Astrology points income is 1000, the first threshold is 5000, so at the start of Day 6 you will automatically convert and get 1 Astrology insight)
Each unlock and upgrade has its own Astrology insights cost.
You must meet the requirements to use unlocked Astrology upgrades, usualy its a Hero level and Mage guild level
Astrology upgrades cannot be reverted

You receive Astrology points only passively from your cities at the start of each turn.
Also you can get x1 Astrology Insight from a map object which is pretty rare.

Each city of every faction has economy buildings which provide Astrology points income increase, just like gold.
When building you must select from a drop down list if you want to receive extra gold, law points or astrology points.