Don't know where to begin?

While ultimately it doesn't matter which arc you begin with, Cecil arc is recommended if you want my recommendation.

Shattered union arc (10)

If you want a central plot to follow, this is the arc you should start with.

This arc deals with the general political situation in Sol system from A.D. 9599 to 9747.

[Shattered union arc] [1] [Revolts] [9599]

Shattered union arc tends to drive the time forward in Two Clusters. This arc deals with major political events and is foundation of many stories.

This arc ends on year 9747.

[Shattered union arc] [2] [Karin Bau] [9603]

Something to note. When this story was written back in 90s, I, for some reason, believed that planet Saturn was a barren planet. When I eventually found out that Saturn was actually a gas planet, it was years later and it was already too late. Numerous stories and lore were created for the planet to just erase the whole thing.

Therefore, Saturn in Two Clusters universe is a barren planet.

[Shattered union arc] [3] [Blackbox] [9601]

[Shattered union arc] [4] [Tournament] [9605]

[Shattered union arc] [5] [1st Earthian-Venusian War] [9607]

[Shattered union arc] [6] [Fraser_s Regime] [9614]

[Shattered union arc] [7] [Omen] [9619]

[Shattered union arc] [8] [2nd Sol-Andromeda war] [9633]

[Shattered union arc] [9] [Regression] [9641]

[Hermit arc] [3] [Moon refugees] [9637] is a recommended story prior reading this one.

United Solar system Federation, or United Sol in short, is deteriorating quickly without any signs of recovery.

[Shattered union arc] [10] [Cheap pride] [9648]

Fraser tries to push his own agenda for once.