How Is Today's Fortune Calculated?

A Saju-based reading of today's fortune isn't a random draw. It's the result of calculating the relationship — called a Ten God — between today's Iljin stem and your own Day Master (the central character of your chart) on the Ten-Thousand-Year calendar. The same person checking on the same day always gets the same answer.

How is this different from a random horoscope?

The difference is whether there's a calculation behind it. The relationship Iljin and your Day Pillar form on the Sixty Gapja system is fixed like a calendar, so an app isn't making it up fresh each day — it's checkable math. That said, declaring that relationship "good" or "bad" outright isn't Saju's job — that part stays in the realm of reference, not verdict.

Why does the grain shift even within a single day?

A day splits into twelve two-hour blocks, and each block's Earthly Branch forms its own relationship with today's Iljin. That's why morning and evening can read with a different grain even on the same day — this, too, is calculation, not mood.