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* Compute topocentric zenith and azimuth angles only.
* Does not compute sunrise, sunset, or solar noon.
*/
export const SPA_ZA = 0 as const;
/**
* Compute zenith, azimuth, and incidence angle for a tilted surface.
* Requires slope and azm_rotation in SpaOptions.
*/
export const SPA_ZA_INC = 1 as const;
/**
* Compute sunrise, sunset, and sun transit (solar noon) in addition to
* zenith and azimuth. This is the default function code.
*/
export const SPA_ZA_RTS = 2 as const;
/**
* Compute all outputs: zenith, azimuth, incidence angle, sunrise, sunset,
* and sun transit. Combines SPA_ZA_INC and SPA_ZA_RTS.
*/
export const SPA_ALL = 3 as const;
export type SpaFunctionCode =
| typeof SPA_ZA
| typeof SPA_ZA_INC
| typeof SPA_ZA_RTS
| typeof SPA_ALL;
export interface SpaOptions {
/** Observer elevation in meters above sea level. Default: 0. */
elevation?: number;
/** Atmospheric pressure in millibars. Default: 1013. */
pressure?: number;
/** Temperature in degrees Celsius. Default: 15. */
temperature?: number;
/** UT1-UTC correction in seconds. Default: 0. */
delta_ut1?: number;
/** TT-UTC difference in seconds. Default: 67. */
delta_t?: number;
/** Surface slope in degrees from horizontal. Default: 0. */
slope?: number;
/** Surface azimuth rotation in degrees from south. Default: 0. */
azm_rotation?: number;
/** Atmospheric refraction at sunrise/sunset in degrees. Default: 0.5667. */
atmos_refract?: number;
/** SPA function code. Default: SPA_ZA_RTS (2). */
function?: SpaFunctionCode;
}
export interface SpaResult {
/** Topocentric zenith angle in degrees. */
zenith: number;
/** Topocentric azimuth angle, eastward from north (navigational convention), in degrees. */
azimuth: number;
/** Local sunrise time as fractional hours. */
sunrise: number;
/** Local sun transit time (solar noon) as fractional hours. */
solarNoon: number;
/** Local sunset time as fractional hours. */
sunset: number;
}
export interface SpaFormattedResult {
/** Topocentric zenith angle in degrees. */
zenith: number;
/** Topocentric azimuth angle, eastward from north (navigational convention), in degrees. */
azimuth: number;
/** Local sunrise time as HH:MM:SS string. "N/A" during polar day/night. */
sunrise: string;
/** Local sun transit time as HH:MM:SS string. "N/A" during polar day/night. */
solarNoon: string;
/** Local sunset time as HH:MM:SS string. "N/A" during polar day/night. */
sunset: string;
}
export interface SpaAnglesResult {
/** Sunrise time for this custom zenith angle. */
sunrise: number;
/** Sunset time for this custom zenith angle. */
sunset: number;
}
export interface SpaResultWithAngles extends SpaResult {
/** Custom angle results, one per angle in the input array. */
angles: SpaAnglesResult[];
}
export interface SpaFormattedAnglesResult {
/** Sunrise time for this custom zenith angle, formatted as HH:MM:SS. */
sunrise: string;
/** Sunset time for this custom zenith angle, formatted as HH:MM:SS. */
sunset: string;
}
export interface SpaFormattedResultWithAngles extends SpaFormattedResult {
/** Custom angle results with formatted times. */
angles: SpaFormattedAnglesResult[];
}
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