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Astro-Geography

Star-planet parans (Brady)

Latitudes where a fixed star and a planet are angular at the same moment, which is how Brady tabulates a paran: not a place, a latitude. Twelve event pairs per star and planet (rise, set, culminate, anticulminate, minus meridian against meridian, which is a shared right ascension rather than a paran). Each row carries the houses of the technique in plain form: which body does what, the latitude, and the meridian where it happens at this chart moment. Solved on hour angles rather than by intersecting map polylines, so the latitude is exact rather than quantised to the polyline step. horizon selects the geometric horizon (default) or the apparent one at -34 arcmin, measured at about two degrees of paran latitude at mid-latitudes.

post/parans/star

Request body

datestring required
timestring required
timezoneOffsetnumber nullable

Hours from UTC at the given moment, not minutes. Fractional zones are hours too: 5.5 for India, 5.75 for Nepal, -3.5 for Newfoundland. Defaults to 0, meaning UTC.

latitudenumber required
longitudenumber required
houseSystemstring
namestring
citystring
zodiacType'tropical' | 'sidereal'
ayanamsaIdnumber nullable
ayanamsa'fagan-bradley' | 'lahiri' | 'de-luce' | 'raman' | 'krishnamurti' | 'kp' | 'yukteshwar' | 'jn-bhasin' | 'true-citra' | 'djwhal-khul'

Sidereal school by name. Lahiri when omitted. Equivalent to ayanamsaId; send either.

cosmogramboolean
starsstring[]

Star names from the Swiss Ephemeris catalogue. Default: the 36-star astrological set.

planetsinteger[]

Swiss Ephemeris planet ids. Default: 0-9, Sun through Pluto.

latitudeLimitnumber

Search range either side of the equator, degrees. Default 60, which is the range Brady tabulates.

horizon'geometric' | 'apparent'

Which horizon counts as rising. geometric (default) is altitude 0, the semi-diurnal arc as written in Meeus. apparent puts it at -34 arcmin, where refraction lifts a body into view first. Worth about two degrees of paran latitude at mid-latitudes, and refraction also breaks the equator mirror that the geometric horizon has, so it is a choice rather than a detail.

Response

Successful calculation

okboolean

Example response

{
  "ok": true
}