Witchy, regarding corrolations along the linear time-line, here's a tropical Age correlation regarding Capricorn as the 10th Sign:
It's the "Decimal Age" when the base-ten number system developed and came into use World-wide.
Also, Age-ruler Saturn is associated with chronometry, meaning accurate timekeeping. In this Age, we rely on clocks accurate to a millionth of a second. Our transactions are dated and timed, our technology requires extremely accurate timing, and the stock market for example, uses split-second timing. In previous Ages, they didn't have that capability, because it didn't suit the Sign/Rulership paradigm.
The tropical Cardinal-sign Ages are innovative, which relates to them as the first Sign of each new Season. These innovations take time to develop, and there's a lot of resistance by attachment to the old ways of doing things. So, this Cardinal-sign Age's innovations started coming in at the midpoint, around 1300 A.D., and steadily progressed, accelerating in the last few degrees, which is where we are now.
In the previous tropical, Cardinal-sign Age, that of Libra, (c.4800 to 3000 B.C.E.), the innovations also developed in the last few degrees, and gave us city-state civilization, which included writing, mathematics, the refining of metals, sophisticated monuments, and walled cities--along with irrigation canals, the wheel, the balance-scale, the plow, and domesticated animal labor.