Answering Your Questions:
Personally, I don’t believe in astrology or horoscopes. I believe they are Biblically prohibited. This recent addition of a 13th sign astrological sign can only be someone’s invention or pet-peeve.
As for the two constellations Ophiuchus and Serpens, they have been recognized as such for over 2000 years. Some cultures recognized Ophiuchus as a healer or a snake charmer. However, E.W. Bullinger in his book ‘The Witness of the Stars’ says that Ophiuchus and Serpens symbolize the struggle with the enemy (serpent/devil). A more detailed explanation is given here: http://philologos.org/__eb-tws/chap13.htm.
As for the Mazzaroth, it is at least as ancient as the book of Job which many scholars believe is likely the oldest book in the Bible. The absolute origin of naming the 12 main constellations is unknown. What you have to understand from the perspective of the ancients was the importance of knowing the seasons of the year. It is likely that the constellations were first named simply to identify a specific section of the sky. It’s sort of like when you go to Disney World and you leave your car in the Goofy parking lot or the Donald Duck parking lot. Both areas are just a parking lot but were named after recognizable characters so you could remember where your car is parked. The 12 Mazzaroth delineations are similar as they are named after odd memorable characters, easily identified as to where the sun had risen through the year.
Most of the constellations, if you connected the dots of the stars, look NOTHING like the character they are supposed to represent. Here is the important point about the twelve: There are roughly 12 cycles of the moon over the time it takes the sun to rise in the same constellation again (the solar year). Consequently, this recent claim of a 13 division zodiac makes little sense. Why not invent 52 constellations and have a different sign for every week (if you take my point)?
I suspect that if the 13 division zodiac is of ancient origin, it was only used every third year or so, representing the LEAP MONTH. A calendar based on the lunar cycle needs a leap month added every third year or so to reconcile the cycles of the moon with the seasons of the sun (the lunar year is 2/3rds of a month short of the solar year).
As for the MEANING of the Mazzaroth, there is very little DIRECT Biblical evidence for asserting a particular meaning. A good story-teller can use any set of characters to tell a story. I suppose some of Bullinger’s work could be in that vein. Imaginary characters in the night sky can be used in a simile or allegory to tell the story of something completely different from the original imaginary character’s story line or intent. Ophiuchus, originally intended to symbolize a healer by one culture is retold as Jesus’ struggle with Satan (Serpens) by another. Teachers have used that method of telling a story for eons. Jesus used the parable. He used commonly known characters to describe certain spiritual truths.
John the Revelator clearly used the symbolism of Greek mythological characters in the sky to say something. For instance Virgo is described specifically in chapter 12. John wasn’t endorsing Greek mythology, but was rather using commonly known characters (to the Gentiles) to tell a different story. I can imagine John in some high place on Patmos telling the other exiled there about Jesus. With his arm stretched toward the night sky and the constellation Virgo, he used her character to explain the Virgin birth. Threatened by the dragon (Draco) or Satan through Herod, Mary and Joseph fled into the wilderness with the Baby Jesus.
The Greek’s identification of the constellation Hydra is based on their mythology. In Greek lore, the Hydra was a sea-creature/serpent that had many heads. According to the myth, each time one head was cut off by Heracles, two more would replace it. In 1 John 2:18, the Bible says that there are MANY antichrists. In similitude to the Hydra story: the antichrist is a serpent with many heads, one can be cut-off (as it were wounded) but more can take its place.
I believe John gives an explanation of the many heads of the antichrist in Revelation 17:
" And there are seven kings: five are fallen, and one is, [and] the other is not yet come; and when he cometh, he must continue a short space.  And the beast that was, and is not, even he is the eighth, and is of the seven, and goeth into perdition." - Rev 17:10-11 KJV
It is likely that when John wrote Revelation, seven true emperors of the Roman Empire existed: Five had fallen (dead were Augustus, Tiberius, Caligula, Claudius and Nero recently); One is (Vespasian emerged emperor over usurpers during the ‘year of four emperors’); and the other is not yet come (into power), and when he cometh, he (Titus) must continue a short space (Titus only lived 2 years after becoming emperor). It was Titus that destroyed the Temple in Jerusalem, dispersing the Jews from the Temple grounds until 1967. The 7th ended with him. The beast that was, and is not (mortal wound), even he is the eighth, and is of the seven and goeth into perdition. This eighth antichrist revived will be of the lineage of those seven. Will the 8th AC resurrect from death in some way? The Bible only says that he will go into perdition, so I don’t know. John’s selection of the mythological Hydra though was very astute. By the way, the constellation Hydra doesn’t ‘move’ in the sense that it relocates elsewhere. It is a very long constellation wrapping nearly 105 degrees around the imaginary celestial sphere. 11-22-1963, the sun was in the constellation Libra, past Hydra.
The Bible states in Genesis that the sun, moon and stars are for signs, seasons, days, years and light. The Hebrew word for ‘signs’ is Strong’s H226 and the definition is varied: benchmark, miraculous sign, banner, warning, omen, token, standard, ensign, etc. On the one hand the celestial lights are the standard-bearers for time itself, while on the other they are intended as warning lights according to those synonyms given in every concordance. The 12 ticks of the Mazzaroth are like the 12 numbers on your clock and are likely the origin of the 12 numbers on your clock. Can we reckon God’s clock: Maybe.
Hope this answers some of your questions.
I was interested in knowing your insight on the revealing of the 13th sign-Ophiuchus! Do you believe God has kept it hidden from the Zodiac seekers all this time and possibly now revealing it because God is allowing those of us with eyes to see it! With your understanding of the stars-could you in simple terms tell me what you think it means? I understand the meaning of Ophiuchus means serpent holder ( Jesus) who crushed the head of Satan.
Do you believe that the meaning of the Mazzaroth is spiritual and at the same time will physically happen? I understand from your writings that you believe Hydra had a mortal wound that was healed-so therefore do you believe that a man will have a mortal wound that is healed? Can you tell me where Hydra was on the constellation chart on November 22, 1963 and also where it is now? Can you by your extensive studies give an approximate date or at least season when the AC will be revealed? Do you believe the rapture of the true believers in Christ will happen before this revealing?
I know I have many questions, but I don't know of anyone else that I can ask!
Thank-you and Blessings!
Bless you John for the many hours you must spend posting!