We present Cerebral, a daily cognitive-field lens for iPhone and Apple Vision Pro. Where our prior work (AstroTeks, this journal, Vol. 1 No. 1) correlated wrist biometrics with planetary transits, Cerebral takes the opposite methodological stance: it makes no biometric claim and instead maps the live sky to a structured, four-element model of daily cognitive disposition — and then shows its work. Every reading in the application exposes the complete derivation that produced it, from raw orbital elements through geocentric ecliptic longitude to the elemental weighting that yields the day’s lens. We call this the glass box: the deliberate inverse of the horoscope’s black box.
Planetary positions are computed entirely on-device from first principles — Standish (1992) Keplerian elements with Meeus (1998) reduction algorithms, and ELP2000 lunar theory — with no lookup tables and no network. The system collects zero data, requires no account, and performs cross-field comparison (“Two Fields”) strictly peer-to-peer via AirDrop, Bluetooth, and Ultra Wideband, never through a server. On Apple Vision Pro the field is rendered spatially: the user stands inside their elements as volumes of light.
The contribution is not a claim about the cosmos. It is an architecture: a transparent, on-device, privacy-zero application that treats a contested input domain with radical computational honesty.
(We are aware that “the anti-horoscope” is a marketing phrase. We use it here only because the architecture literally is one: the horoscope hides the math; we publish it on screen.)
Keywords
cognitive-field mapping
on-device ephemeris
glass-box computation
four-element model
peer-to-peer synastry
spatial computing
privacy-by-architecture
0. The Instrument
What Cerebral Actually Is
Cerebral is a free, on-device app for iPhone and Apple Vision Pro. There is no account, no cloud, no fee, and nothing to collect. It reads the real sky — computed on your device — and maps it to a daily cognitive lens: the day’s leading element read against your own. It does not forecast. It is a mirror, not an oracle. The governing sentence is the same one that defines the whole division: mapped, not predicted.
The Daily Lens
- Today’s Field — the day’s leading element against yours: spark, structure, signal, depth
- Your Portrait — your cognitive field, drawn from your birth moment, computed from first principles
- Reflect — a quiet journal that reads each day against your field; yours alone
The Deep Tools
- The Wheel — your whole sky placed at real longitudes, full aspect web, every degree live
- The Math — the glass box: see exactly how every reading is computed
- Two Fields — bring another person’s field into the room; honest synastry, overlap never fate
- The Field · Vision Pro — stand inside your elements as volumes of light
Four elements. One mind. Zero data collected. We will spend the rest of this paper explaining the third claim as carefully as the first two, because it is the one most apps get wrong.
1. Introduction
The Black Box and Its Inverse
1.1 Background
The consumer astrology category is, almost without exception, a black box. An app collects a birth time, transmits it to a server, and returns prose. The user cannot see the ephemeris, cannot audit the logic, and cannot tell whether a real calculation occurred at all or whether a language model wrote something plausible. The data, meanwhile, is gone — uploaded, retained, and frequently monetized. Birth-time-and-location is among the most identifying records a person can surrender.
We considered this an architecture problem before a content problem. The interesting question was not “is astrology true” — a question Cerebral deliberately declines to answer — but “can a contested input domain be treated with complete computational honesty on a device that keeps everything.”
We do not claim the sky governs cognition. We claim that if you are going to map one to the other, you owe the user the entire derivation and none of their data should ever leave the phone. That is a falsifiable engineering promise, not a belief.
1.2 Objectives
Technical Objectives
- First-principles ephemeris on-device, no lookup tables, no network
- A glass-box reading surface: every output traceable to its inputs
- Serverless peer-to-peer field comparison
- Spatial rendering of the elemental field on visionOS
Design Objectives
- A daily lens framed as reflection, never prediction
- Zero data collection as a structural property, not a policy
- No account, no friction: useful the instant it opens
- An honest synastry model: overlap and stretch, never fate
1.3 The Glass-Box Principle
P₁ · Transparency
Every reading the application presents must be reducible, on screen, to the exact computation that produced it — from orbital elements to elemental weighting.
P₂ · Locality
All computation and all storage occur on the user’s device. Cross-device features use direct peer-to-peer transport. No server is contacted at any point.
P₀ · Restraint
The application makes no predictive or deterministic claim. It presents a structured lens and labels it as such. “Mapped, not predicted” is enforced in copy and in scope.
2. Methods
Architecture & Computation
2.1 Platform
Hardware / OS
- iPhone (iOS) and Apple Vision Pro (visionOS)
- Shared Swift core (KenshoKit) · AquaSymbolics symbol/audio library
- RealityKit for the spatial field on visionOS
Computation
- On-device ephemeris (Standish 1992 + Meeus)
- ELP2000 lunar theory for the Moon
- No lookup tables · no network calls · first principles
2.2 Astronomical Calculation
Planetary positions use Standish (1992) Keplerian orbital elements (JPL, “Keplerian Elements for Approximate Positions of the Major Planets”), accurate to a fraction of a degree across the supported era. For each body we solve Kepler’s equation, then convert heliocentric coordinates to geocentric ecliptic longitude using Meeus’s (1998) reduction algorithms. The Moon is computed via ELP2000 lunar theory. Geocentric conversion is essential — heliocentric positions produce errors of up to 29° for inner planets. Crucially, none of this is a stored table: the app derives positions from the elements at run time, which is what makes the glass box possible.
| Quantity | Method | Notes |
|---|
| Planet longitudes | Standish 1992 + Meeus | geocentric ecliptic, sub-degree |
| Lunar position | ELP2000 | on-device |
| Ascendant / houses | sidereal time + obliquity | whole-sign |
| Aspects | pairwise angular separation | orb-weighted |
2.3 The Four-Element Cognitive Model
Each placement contributes to one of four elemental registers — fire (spark), earth (structure), air (signal), water (depth) — framed throughout as modes of mind, not personality verdicts. The day’s leading element is read against the user’s natal balance to produce the daily lens. The mapping from placement to register, and the weighting that yields the day’s reading, are presented as a designed model. We do not assert it is the model; we assert it is fully visible.
2.4 The Glass Box
“The Math” surface is the paper’s central artifact. For any reading, the user can open the full derivation: the Julian date, the orbital elements used, the solved anomalies, the resulting longitudes, the aspects detected with their orbs, and the elemental weighting that produced the lens. There is no hidden step. This is the deliberate inverse of the category norm, and it is also a self-imposed correctness constraint: a derivation shown on screen is a derivation that cannot quietly be faked.
2.5 Two Fields (Peer-to-Peer Synastry)
Cerebral compares two people’s fields without a server. A portrait is exchanged device-to-device over AirDrop, Bluetooth, or Ultra Wideband; the synastry — where two minds meet, where they stretch — is computed locally on each device. This is the iOS counterpart to the constraint documented for AstroTeks on watchOS: there, no peer transport exists between strangers’ watches, so data is entered by hand. On iPhone the transport does exist, so we use it — and still never touch a server. The reading is framed as overlap, never fate.
2.6 Privacy Architecture
What is collected
- Nothing. No analytics, no identifiers, no crash reports.
- No servers are contacted at any point.
- Birth moment, journal, and computed sky live only on-device.
What is shared
- Only what you AirDrop, only when you choose to.
- Peer-to-peer, device-to-device, never via a server.
- No account, no login, no email — ever.
3. Spatial
The Field on Apple Vision Pro
On visionOS the elemental field becomes volumetric. Rather than reading a chart, the user stands inside it: the four elements rendered as volumes of light, each sized to the user’s chart, the aspect web suspended in space. The same on-device computation drives the same numbers — only the surface changes. The point is not spectacle; it is that a cognitive lens you can walk around is harder to mistake for a verdict than one you read off a card.
4. Conclusion
What We Built and What We Withhold
Cerebral demonstrates that a contested input domain can be handled with complete computational transparency on a device that collects nothing. A real ephemeris runs on the phone. Every reading shows its derivation. Synastry happens peer-to-peer. The field becomes spatial on Vision Pro. None of this required a server, an account, or a single byte of telemetry.
We withhold the one thing the category usually sells: certainty. Cerebral makes no prediction and renders no verdict. It offers a structured daily lens, labels it as a lens, and shows you exactly how it was built — so you can take it, leave it, or argue with the math. The off-switch is part of the design. It is a door out, not a trap in.
“The horoscope hides the math.
We put it on the screen and let you decide.”
References
- Standish, E. M. (1992). Keplerian Elements for Approximate Positions of the Major Planets. JPL Solar System Dynamics.
- Meeus, J. (1998). Astronomical Algorithms (2nd ed.). Willmann-Bell.
- Chapront-Touzé, M., & Chapront, J. (1983). The lunar ephemeris ELP 2000. Astronomy and Astrophysics, 124, 50–62.
- KenshoTek Research Division (2026). Temporal-Biometric Correlation in Planetary Transit Detection: A Wearable Implementation. Journal of Consciousness Technology, 1(1). [Companion paper — AstroTeks]
Appendix
Technical Documentation
A
On-Device Ephemeris Engine
KenshoKit · ephemeris core (Standish + Meeus)
Keplerian elements with per-body Kepler-equation solving and heliocentric-to-geocentric reduction; ELP2000 for the Moon. Derived at run time, not tabulated — the precondition for the glass box.
B
The Math Surface
Cerebral · glass-box reading view
Renders the full derivation for any reading: Julian date, elements, solved anomalies, longitudes, aspects with orbs, elemental weighting. No hidden step.
C
Two Fields Transport
Cerebral · peer-to-peer synastry
Portrait exchange over AirDrop / Bluetooth / Ultra Wideband; synastry computed locally on each device. No server, no relay, no copy retained.
Conflicts of Interest: This work is authored by KenshoTek LLC, developer of Cerebral. We acknowledge commercial interest and offset it the only way we find credible: the application shows its own computation on screen and collects no data to bias. The glass box is the disclosure.
Acknowledgments: We thank E. M. Standish and the JPL Solar System Dynamics group, Jean Meeus, and the ELP2000 authors, whose published algorithms make on-device ephemeris possible. We thank the people who tested an app that refused to tell them their future and tried it anyway.
| Version | Date | Status | Notes |
|---|
| v1.0 | Jun 6, 2026 | In review | The Glass Box — iPhone + Apple Vision Pro, on-device ephemeris, Two Fields |
| v1.1 | TBD | Planned | Deeper journal pattern view; expanded spatial field |
“Not a forecast. A mirror.
And the mirror shows its silvering.”
KenshoTek Research Division · Room 237 · Hollywood Basement · June 2026
Journal of Consciousness Technology
· Vol. 1, No. 2 · Jun 2026