predictive

Firdaria Planetary Periods

Calculate firdaria (فرادير) — the medieval Persian planetary period system that assigns each of the seven classical planets a fixed number of years as the dominant ruler of life. The 75-year master cycle differs for day births (diurnal) and night births (nocturnal). Each major period is subdivided into seven sub-periods in Chaldean order.

Firdaria operates independently of signs and houses — it is purely a time-based system making it complementary to profections and transits. Think of it as a 75-year program schedule: knowing your current major and sub-period ruler tells you which planetary archetype is most active in your life right now.

🤖 Agent-first endpoint — pure deterministic math, no ephemeris required.

post/predictive/time-lords/firdaria

Request

  • Base URL: https://api.openephemeris.com
  • URL: https://api.openephemeris.com/predictive/time-lords/firdaria
  • Auth: one of:
    • HTTP bearer
    • API key in header X-OpenEphemeris-API-Key
    • API key in header X-API-Key
    • API key in header X-Service-Key

Query parameters

formatstring

Response format: json | llm.

output_modestring nullable

Deprecated: use format. Accepts full|simple|llm.

Request body

birth_datetimestring date-time required

Natal birth datetime in ISO 8601 UTC format.

house_systemstring

Optional.

is_day_birthboolean required

True if the native was born during the day (Sun above the horizon). Determines the diurnal vs nocturnal firdaria sequence. In diurnal charts, the Sun leads; in nocturnal charts, the Moon leads.

latitudenumber

Optional. If provided, calculates natal chart to determine ascendant/sect/lots.

longitudenumber

Optional.

target_datetimestring date-time

Date to evaluate the active period for. Defaults to the current date if omitted.

Response

Successful Response

birth_datetimestring

Birth datetime used for the calculation.

is_day_birthboolean

Whether the native is diurnal (day birth).

output_modestring nullable

Output projection mode (json | llm).

successboolean required

Whether the calculation succeeded.

Changes

No recorded changes to this operation across all 1 revision of this API.