About 🜂 Z13 Astrology
Z13 is a true sidereal astrology system that brings you:
💫 13 signs (because Ophiuchus - the serpent bearer - deserves some love).
💫 Whole sign houses
💫 Astronomically-accurate placements, based on the actual constellations you can see every night
This isn’t tropical. It’s not Vedic. It’s not even your average sidereal.
Z13 is a custom-mapped system built on open ephemeris data, raw sky coordinates, and one core principle:
The stars whispered the story of your soul's journey the day you were born. If you want to learn about that journey, look at where the stars were.
Z13 doesn’t believe your future is written in the stars - this isn't a cosmic fortune cookie. 🥠
But your starting point is.
Astrology is a map, not a prophecy. A whisper, not a command.
It shows you the energy you were born into, the patterns you carry, and the ways you might grow, evolve, and rewrite your story.
Welcome to Z13.
Welcome to the real sky, the real signs, and the real story.
About this website
This website is a labour of love - and a cosmic side quest I never saw coming. This space exists to share what I’ve learned, what I’ve questioned, and what I’ve felt while mapping the sky and the soul. Along the way, I’ve added my own intuitive flourishes - the sky don't lie, and sometimes looking at the actual sky give me an epiphany that there was a better perspective to think from.
And I promise two things:
First - the natal chart will always be free to use. The core resources signs, planets, aspects, houses will always be available. Astrology should be a mirror you can reach for anytime, not a paywall.
Second - your information stays sacred. Birth details, email sign-ups - anything you share lives here, within Z13, and nowhere else. No data-harvesting, no shady sharing. Just one person (hi, it’s me 👋) holding it with care.
And a little about me
Hey there. I'm Arjay - teacher, artist, over-thinker, and the guy who accidentally built a new astrology system because I couldn’t stop asking questions. (And because I’m always down for a good dopamine quest. 😉)
With a Virgo Sun’s need for coherence, a Pisces Moon’s reverence for the unseen, and a Libra Rising’s instinct for balance, I believe astrology should be both beautiful and useful.
It should fit together with elegance, land in your soul like poetry, and create harmony in your life.
Z13 started as something I built for myself - a soul-deep itch that needed scratching. Now, I get to share the map with anyone who’s ever looked up and wondered what the sky was really saying.