1) Zygós (Gr. Ζυγός) Libra (beginning on Sept.21) ruled by Æstía (Hestia; Gr. Ἑστία)
2) Skorpiós (Gr. Σκορπιός) Scorpio (Oct.21) ruled by Áris (Ares; Gr. Ἄρης)
Stability (Stathærótis; Gr. Σταθερότης). The astrological symbol for Skorpiós represents the soul, pulsing with Life (Zoï; Gr. Ζωή), commencing on its journey.
3) Toxótis (Gr. Τοξότης) Sagittarius (Nov.21) ruled by Ártæmis (Artemis; Gr. Ἄρτεμις)
Changing (Mætavolí; Gr. Μεταβολή). The astrological symbol for Toxótis or Sagittarius is the arrow pointing upward as the soul, filled with Energy (Ænǽryeia; Gr. Ἐνέργεια) progresses forward.
4) Aigokǽrohs (Gr. Αἰγοκέρως) Capricorn or Brumalis (Dec. 21) ruled by Íphaistos (Hephaestus; Gr. Ἥφαιστος)
Great Energizing. Íphaistos, with his creative forge, creates Form (Morphí; Gr. Μορφή). The beauty of the form created by Íphaistos is perfected at the eighth level, that of Aphrodíti, which is why Íphaistos is connected with her in mythology. It is on the fifth of Capricorn (the 25th of December, the 24th at dusk) during the first dækanós (ten days; Gr. δεκανός) of the month in which we celebrate the first appearance of Diónysos (Dionysus; Gr. Διόνυσος).
5) Ydrokhóös (Gr. Υδροχόος) Aquarius (Jan.21) ruled by Íra (Hera; Gr.Ἥρα)
Stability. Íra uses the great power of Attraction (Ǽrohs; Gr. Ἔρως) to bring together divinity and the soul.
6) Ikhthýs (Gr. Ἰχθῦς) Pisces (Feb.21) ruled by Poseidóhn (Poseidon; Gr. Ποσειδῶν)
Changing. Poseidóhn causes the soul to Progress (Próödos; Gr. Πρόοδος), as the legs move us forward.
7) Kriós (Gr. Κριός) Aries (March 21) ruled by Athiná (Athena; Gr. Ἀθηνᾶ)
Great Energizing. Athiná rules the law of Co-Influence (Allilæpídrasis; Gr. Ἀλληλεπίδρασις), which binds the centers.
8) Távros (Gr. Ταύρος) Taurus (April 21) ruled by Aphrodíti (Aphrodite; Gr. Ἀφροδίτη)
Stability. After the great struggles which the soul requires in order to grow, struggles brought on by Áris, Aphrodíti then brings Harmony (Armonía; Gr. Ἁρμονία).
9) Dídymi (Gr. Δίδυμοι) Gemini (May 21) ruled by Apóllohn (Apollo; Gr. Ἀπόλλων)
Changing. The Harmony brought about by Aphrodíti creates the environment in which Apóllohn can bring Freedom (Ælefthæría; Gr. Ἐλευθερία).
10) Karkínos (Gr. Καρκίνος) Cancer (June 21) ruled by Ærmís (Hermes; Gr. Ἑρμῆς)
Great Energizing. Apóllohn has given the great staff of the two solar serpents to Ærmís; the law of Movement (Kínisis; Gr. Κίνησις) begins here, but now in the Divine world.
11) Lǽohn (Gr. Λέων) Leo (July 21) ruled by Zefs (Zeus; Gr. Ζεύς)
Stability. Zefs has dominion over the law of Life (Zoï; Gr. Ζωή) in the Divine world.
12) Stákhys (meaning Wheat-Ear; Gr. Στάχυς; in Latin it is Spica, Wheat-Ear) Wheat-Ear  (Aug.21) ruled by Dimítir (Demeter; Gr. Δημήτηρ)
Changing. Dimítir has dominion over the Law of Energy (Ænǽryeia; Gr. Ἐνέργεια) in the Divine World.
Thus, it can be said that Æstía is the Zohdiokrátohr (presiding Zodiacal deity) of Zygós (Libra), Áris is the Zohdiokrátohr of Skorpiós (Scorpio), and so forth.
The two Solstices, summer and winter, are called Tropai (Solstices; Gr. Τροπαί, plural). Tropí (Gr. Τροπή) is singular.The two Equinoxes, spring and autumn, are called Ismæríai (Equinoxes; Gr. Ἰσημερίαι, plural). Isimæría (Gr. Ἰσημερία) is singular.
Why are they important? Every year there are four times when it is said that the Gates to Divinity are particularly open: the Summer and Winter Tropai and the Spring and Autumn Ismæríai. It is also said that at the full moon, the Aithír (Ether or Aether; Gr. Αἰθήρ) is "swollen."
Each Íkos begins on the 21st day of every Roman calendar month. The yearly cycle of zodiacal Mystery months begins on September 21st. This is the equinox and it is particularly important; it is the New Year, the commencement of Zygós (Libra; Gr. Ζυγός), the month of Æstía. As we always honor Æstía first with every ritual, we also recognize her month as the beginning of the year. 
The Isimæría on September 21 is the commencement of autumn in the Northern Hemisphere, where it is called the Phthinopohriní Isimæría (Fthinoporini Isimeria; Gr. Φθινοπωρινὴ Ἰσημερία), the autumn equinox. However, September 21st is the beginning of spring in the Southern Hemisphere where the festival is called the Æariní Isimæría (Eariní Isimeria; Gr. Ἐαρινὴ Ἰσημερία), the spring or vernal equinox. Regardless of which hemisphere you live in, the Mystic year begins on September 21, whether it is Spring or Autumn.
Comparison with the Astonomicon of Marcus Manilius
Some of the zodiacal rulerships as presented above may contradict what is found in popular modern astrology, but in ancient astrology it is another matter. Marcus Manilius wrote his epic poem Astronomicon during the later years of the life of Caesar Augustus, finishing it sometime after the emperor's death. This is an important treatise, in poetic form, on the subject of ancient astrology. As in the Orphic system passed down from contemporary Greek teachers to the author of this essay, Manilius gives guardianship of each zodiacal sign to an Olympian deity. His associations are identical to the above list with the exceptions of Íphaistos and Æstía. In our system, Íphaistos rules Aigokǽrohs-Capricorn and Æstía rules Zygós-Libra but Manilius reverses this making Íphaistos rules Libra and Æstía ruling Capricorn. Why they are switched is not known to this author. Nonetheless, in the Orphic system, Íphaistos and Æstía are Divine Consorts of one another, making the two lists are virtually identical:
"What step must one take next, when so much has been learnt? It is to mark well the tutelary deities appointed to the signs and the signs which Nature assigned to each God, when She gave to the great virtues the persons of the Gods and under sacred names established various powers, in order that a living presence might lend majesty to abstract qualities. Pallas (ed. Athiná) is protectress of the Ram (ed. Aries) , the Cytherean (ed. Aphrodíti) of the Bull (ed. Távros), and Phoebus (ed. Apóllohn) of the comely Twins (ed. Dídymi); you, Mercury (ed. Ærmís), rule the Crab (ed. Karkínos), and you, Jupiter (ed. Zefs), as well as the Mother of the Gods,  the Lion (ed. Lǽohn); the Virgin (ed. Virgo or Wheat-Ear) with her sheaf belongs to Ceres (ed. Dimítir), and the Balance (ed. Libra) to Vulcan (ed. Íphaistos) who wrought it; bellicose Scorpion (ed. Skorpiós) clings to Mars (ed. Áris); Diana (ed. Ártæmis) cherishes the hunter, a man to be sure, but a horse in his other half (ed. Sagittarius, Kheirohn; Gr. Χείρων), and Vesta (ed. Æstía) the cramped stars of Capricorn; opposite Jupiter (ed. Zefs),  Juno (ed. Íra) has the sign of Aquarius (ed. Ydrokhóos), and Neptune (ed. Poseidóhn) acknowledges the Fishes (ed. Ikhthýs) as his own for all that they are in heaven." 
Manilius also groups the Olympian Gods in pairs. He couples Athiná with Íphaistos while in the tradition taught to this author, Athina is the consort of Ærmís. Manilius pairs Æstía with Ærmís, while in our system it is Æstía-Íphaistos:
CHART OF PAIRS (Divine Consorts) ACCORDING TO MANILIUS: 
1. Aries → Minerva : Vulcan ← Libra
2. Taurus → Venus : Mars ← Scorpio
3. Gemini → Apollo : Diana ← Sagittarius
4. Cancer → Mercury : Vesta ← Capricorn
5. Leo → Jupiter : Juno ← Aquarius
6. Virgo → Ceres : Neptune ← Pisces
During the Renaissance, this order of the pairs was known. Marcilio Ficino confirms this in book IV, Chapter I of his Platonic Theology, following Manilius:
"This is where the Pythagoreans, accordingly, locate the twelve divine souls: in Aries' heart, Pallas; in Taurus', Venus; in Gemini's, Phoebus "particular"; in Cancer's, Mercury; in Leo's, Jupiter "particular"; in Virgo's, Ceres; in Libra's, Vulcan; in Scorpio's, Mars; in Sagittarius', Diana; in Capricorn's, Vesta; in Aquarius', Juno; and in Pisces', Neptune." 
Our tradition gives the Divine Consorts, the Pairs of Gods, Ta Zévyi