We can use decans (the 30 degree Signs divided into three 10 degree segments) to see how the Modality relates to when a tropical Age becomes most effective in manifesting the intrinsic nature of the Age-sign itself. Fortunately, the timeline of Western history includes an entire seasonal quadrant of Ages: Tropical Age of Libra (Cardinal), c. 4850-3100 B.C.E.; then, the tropical Age of Scorpio (Fixed), c. 3100-1350 B.C.E.; and, completing the Fall quadrant, the tropical Age of Sagittarius (Mutable), c. 1350 B.C.E.-400 A.D.
The Cardinal-sign Age begins a new seasonal quadrant: Innovative and inventive, with great resistance from the ways of the previous quadrant, which pushes the most representative developments into the 3rd decant.
The Fixed-sign Age then inherits the new theme which fully develops at the ENDING of the LAST decant of the Cardinal-sign Age. Fixed-sign Ages are established and intense, with almost no resistance from the preceding seasonal quadrant; and, the result is an immediate response at the BEGINNING of the FIRST decant of the Age in accordance with the nature of the Age-sign.
The Mutable-sign Age inherits the theme introduced in the last decant of the Cardinal-sign Age, and all of the intense developments of the Fixed-sign Age. The result is a variation on the theme, exploring the possibilities, especially in the MIDDLE decant.
As this pattern predicts, we're now in the most materialistic, innovative and inventive phase at the ending of the tropical, Cardinal/Earth-sign Age of Capricorn, ruled by Saturn, which became an imperative in Western Europe at the beginning of the last decant c. 1570 A.D.
It also predicts that the tropical Aquarian Age developments will get off to a full and immediate start when the Mean-setting of the Age-indicator reaches 0 degrees Aquarius in 2149.
Until then, our current situation is mostly about advancements in Capricornian-Age technology, enabling the implementation of the new theme of this Winter Age-quadrant which is superseding the city-state cultural theme of the Fall Age-quadrant: This new theme, which will be inherited by the Aquarian Age, is an interconnected and interdependent worldwide culture. BUT, it will be under URANIAN, not Saturnian rulership authority as it is now--HUGE difference!