What is Horoscho Chart?
Horoscho Chart is an astrology web app that calculates and displays horoscopes from birth data with high precision. It is built on the astronomical computation library Skyfield and JPL ephemeris data (DE440 / DE441), the same data used in professional astronomy.
The app runs at toolbox.horoschola.jp and works in any modern browser — no installation required. Access is provided with a personal ID and password after purchase.
Main Features
Natal Chart
Single-wheel chart with aspects, house systems, and detailed position data.
Bi-Wheel
Compare two charts — transits, progressions, synastry — in a double wheel.
Tri-Wheel & 5-Wheel
Layer up to five charts to read multiple techniques at a glance.
Timing Table
Tabular view of exact transit and progression hits for timing work.
Declination Graph
Visualize declinations, parallels, and out-of-bounds planets over time.
Midpoints & Harmonics
MP/HM screens for midpoint trees and harmonic charts.
Analysis Graph
Graphical chart analysis to grasp a chart’s overall balance quickly.
Graphic Ephemeris
Monthly graphic ephemeris for reading planetary movement visually.
Void Calendar
Void-of-course Moon calendar for everyday electional use.
LIFELOG
Record life events and review them against your chart over time.
Flexible Input
Birth-data input with place search, time zones, and historical dates.
Rich Settings
House systems, orbs, bodies, colors — tune the app to your practice.
Pricing
¥19,800 JPY (tax incl.)
One-time purchase. No subscription. Includes your personal login and future updates.
Charged in Japanese yen. Cards issued outside Japan are converted by your card issuer.
Free Tools
We also offer Current Sky — a free, real-time chart of the sky right now, running on the same engine as the app — and free monthly & yearly graphic ephemerides. See the free tools page.
About & Contact
Horoscho Chart is developed by prema, a professional astrologer with 30 years of experience in Western astrology. Read more about prema, or get in touch with any questions before purchase.