Western Astrology

Western Monthly Transits

30-day transit window vs natal chart. Returns day-by-day transit snapshots plus peak aspects (active 10+ days in the window). Use start_date to set the month start. Defaults to today.

post/v1/western/transits/monthly

Request

  • Base URL: https://api.asterwise.com
  • URL: https://api.asterwise.com/v1/western/transits/monthly
  • Auth: HTTP bearer

Request body

locationstring nullable

City name to resolve to lat/lon/tz automatically. Example: 'Mumbai' or 'New Delhi, India'. If provided, latitude, longitude and timezone are not required.

namestring

Person name associated with the birth record

datestring required

Birth date in YYYY-MM-DD format

timestring nullable

Birth time in HH:MM 24-hour format. If omitted, the chart is cast for 06:00 local time (not a sunrise chart) and birth_time_provided is false: houses, the Ascendant, the sect and the Moon's exact degree are then approximate.

latitudenumber nullable

Latitude. Required if location not provided.

longitudenumber nullable

Longitude. Required if location not provided.

timezonestring nullable

IANA timezone. Required if location not provided (unless utc_offset is given). For dates before the zone adopted a standard time, the birthplace's local mean time (longitude / 15 hours) is used.

utc_offsetstring nullable

Optional explicit UTC offset of the birth time, as ±HH:MM or ±HH:MM:SS (e.g. '+04:51:31' for Bombay mean time). Overrides the offset timezone would give. Use it when the birth record states the offset, or for historical local times the IANA database cannot represent.

ayanamsa'lahiri' | 'raman' | 'kp' | 'tropical'

Ignored on Western endpoints: positions are always tropical (no ayanamsa). Accepted so one birth object can be sent to Vedic and Western endpoints alike.

house_system'placidus' | 'koch' | 'equal' | 'whole_sign'

House system for the natal houses that transiting planets are placed in (natal_house on each transit planet). Same choices as the natal chart; Placidus is the default.

snapshot_timestring nullable

Local clock time (HH:MM) at which each day's sky is read, in snapshot_timezone. Default: 12:00 UTC, as before. Pass the user's own time so the Moon and the fast planets are where the user sees them.

snapshot_timezonestring nullable

IANA timezone for snapshot_time. Defaults to the birth timezone when snapshot_time is given.

start_datestring nullable

Transit reference date (YYYY-MM-DD): snapshot day for daily transits; window start for weekly (7 days) and monthly (30 days). Defaults to today.

Example request

{
  "ayanamsa": "lahiri",
  "date": "1985-11-12",
  "latitude": 19.055,
  "location": "Mumbai",
  "longitude": 72.8692,
  "name": "Arjun Mehta",
  "time": "06:45",
  "timezone": "Asia/Kolkata"
}

Response

Successful Response

successboolean

True if the request succeeded

messagestring

Human-readable status message

Example response

{
  "data": {
    "days": [
      {
        "transit_planets": [
          {
            "aspects_to_natal": [
              {
                "exact_at": "2026-05-03T14:07:55Z",
                "days_to_exact": 2.087
              }
            ],
            "natal_house": 7
          }
        ],
        "aspects": [
          {
            "exact_at": "2026-05-03T14:07:55Z",
            "days_to_exact": 2.087
          }
        ],
        "house_system": "placidus"
      }
    ],
    "peak_aspects": [
      {
        "exact_at": "2026-05-03T14:07:55Z",
        "days_to_exact": 2.087
      }
    ],
    "house_system": "placidus"
  }
}

Changes

No recorded changes to this operation across all 2 revisions of this API.