Destiny Grid

Enter your birthdate and birthplace to see your entire life mapped year by year. Switch between two ancient systems: Western Astrology (Jupiter returns, Saturn cycles, Chiron wounds) and 四柱八字 Saju — the Korean Four Pillars of Destiny, built on Heavenly Stems (天干), Earthly Branches (地支), and the Five Elements (五行). Each cell in the grid represents one year, colored by its dominant energy.

The algorithm calculates real planetary cycle timing: Jupiter completes an orbit roughly every 11.86 years (so your Jupiter return years get a fortune boost), while Saturn takes about 29.5 years (the dreaded Saturn return at ~29 and ~58). Chiron, the “wounded healer” asteroid, runs a ~50-year orbit with a highly elliptical path — which is why its influence hits different depending on your birth era. Your birth latitude marginally adjusts the base fortune score, because the ancient astrologers who designed these systems mostly lived in the Mediterranean and the math shows it.

To use it: enter your birth year, month, day, and optionally your birth latitude. For the Saju tab, you can also specify your birth hour (時辰) and gender (for 大運 direction). The grid renders instantly, client-side, with no data sent anywhere. Hover or tap any cell to see the detailed breakdown for that year. Use the Share button to generate a screenshot-ready card.

Read the full build log: Playground Is Live: The Destiny Grid, Real Astrology, and Why I'm Shipping a Toy Every Month