Sidera: Korean Astrology

Sidera computes the sky and the four pillars of the moment you were born, and talks with you about what is actually there.

■ Two systems, side by side
Saju is the Korean reading of a birth moment: the year, month, day, and hour written as eight characters. The Western birth chart reads the same moment as planets, signs, and houses. Sidera runs both from the same birth data and sets them next to each other. You choose which to read from; the default is both. Where the two systems point at the same thing, and where they disagree, are called out separately.

■ The AI does not do the math
Planetary positions and Saju pillars come from a deterministic engine. The AI reads what was computed and interprets it. The same birth details always produce the same chart.

■ Nothing is hidden behind the answer
You can open the raw Saju chart and the raw birth chart in the app. Heavenly stems and earthly branches, the balance of the five elements, planetary positions, house cusps, aspects — all of it. Tap the small number in an answer and you go straight to the placement that sentence rests on.

■ Held up against MBTI
Enter the MBTI type you know yourself by, and Sidera sets it beside the disposition read from your chart and names the axes that disagree. It does not rule one of them correct. The gap itself is what gets discussed.

■ You pick the method
There is more than one way to divide the twelve houses. Whole Sign, Placidus, Equal, and Porphyry are all here, each with an explanation of what it does. On the Saju side you can decide whether to use true solar time and whether hours after 11pm belong to the next day.

■ Compatibility
Register two people and Sidera lays the two skies and the two charts over each other, reading where they lock together and where they pull apart.

Signing up gives you five free questions. Viewing the raw charts and managing profiles stays free.

Sidera's readings are for reference. They do not replace medical, legal, or financial advice, or a conversation with a professional.