plan_golden_hour
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Compute golden [-4,+6 degrees] and blue [-6,-4 degrees] photographic windows for the geometric solar centre during one strict UTC day [00:00, next 00:00), without refraction. Input must be a real Gregorian midnight from 1900 through 2100, latitude -89..89 and East-positive longitude -180..180. Return UTC millisecond windows and threshold crossings, unrounded solver durations, midpoint azimuths when defined, day extrema, boundary-clipped flags and bounded numerical work. Sunrise/sunset crossings at geometric -0.833 degrees use a separate convention, not official refracted upper-limb sunrise. Absent windows are valid empty results. Terrain, buildings, clouds, weather and lighting quality are not modelled. Numerical search tolerance is not astronomical uncertainty; oracle fixtures cover reference dates, not the entire accepted year range. Uses the same solar primitives as shadow and ephemeris engines, so combined results are not independent corroboration. Independently callable Rust CPU tool; a complete-request composition binding requires no invented adapter.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| date_utc | string | yes | Real Gregorian UTC midnight, year 1900–2100. Rust also validates month/day and leap years. Other hours are rejected, never truncated; this is not a local civil day. |
| latitude | number | yes | Degrees, North positive. |
| longitude | number | yes | Degrees, East positive. |
Raw JSON schema
{
"$schema": "http://json-schema.org/draft-07/schema#",
"type": "object",
"properties": {
"date_utc": {
"type": "string",
"minLength": 20,
"maxLength": 20,
"pattern": "^(?:19\\d{2}|20\\d{2}|2100)-\\d{2}-\\d{2}T00:00:00Z$",
"description": "Real Gregorian UTC midnight, year 1900–2100. Rust also validates month/day and leap years. Other hours are rejected, never truncated; this is not a local civil day."
},
"latitude": {
"type": "number",
"minimum": -89,
"maximum": 89,
"description": "Degrees, North positive."
},
"longitude": {
"type": "number",
"minimum": -180,
"maximum": 180,
"description": "Degrees, East positive."
}
},
"required": [
"date_utc",
"latitude",
"longitude"
],
"additionalProperties": false
}