mirror of
https://github.com/acamarata/qibla.git
synced 2026-06-30 19:04:28 +00:00
95 lines
2.9 KiB
Markdown
95 lines
2.9 KiB
Markdown
# qibla
|
|
|
|
[](https://www.npmjs.com/package/qibla)
|
|
[](https://github.com/acamarata/qibla/actions/workflows/ci.yml)
|
|
[](LICENSE)
|
|
|
|
Qibla direction, great-circle path, and haversine distance. Pure math, zero dependencies.
|
|
|
|
## Installation
|
|
|
|
```bash
|
|
npm install qibla
|
|
```
|
|
|
|
## Quick Start
|
|
|
|
```typescript
|
|
import {
|
|
qiblaAngle,
|
|
compassDir,
|
|
distanceKm,
|
|
KAABA_LAT,
|
|
KAABA_LNG,
|
|
} from "qibla";
|
|
|
|
// Bearing from New York to the Ka'bah
|
|
const bearing = qiblaAngle(40.7128, -74.006);
|
|
console.log(bearing); // ~58.48
|
|
console.log(compassDir(bearing)); // "NE"
|
|
|
|
// Distance in kilometers
|
|
const km = distanceKm(40.7128, -74.006, KAABA_LAT, KAABA_LNG);
|
|
console.log(km); // ~9,634
|
|
```
|
|
|
|
## API
|
|
|
|
### `qiblaAngle(lat, lng): number`
|
|
|
|
Computes the initial bearing (forward azimuth) from the given coordinates to the Ka'bah.
|
|
|
|
| Parameter | Type | Description |
|
|
| ----------- | -------- | ----------------------------------------------- |
|
|
| `lat` | `number` | Latitude in decimal degrees (-90 to 90) |
|
|
| `lng` | `number` | Longitude in decimal degrees (-180 to 180) |
|
|
| **Returns** | `number` | Bearing in degrees clockwise from north (0-360) |
|
|
|
|
Throws `RangeError` if coordinates are out of bounds.
|
|
|
|
### `compassDir(bearing): CompassAbbr`
|
|
|
|
Eight-point compass abbreviation: N, NE, E, SE, S, SW, W, NW.
|
|
|
|
### `compassName(bearing): CompassName`
|
|
|
|
Full compass name: North, Northeast, East, Southeast, South, Southwest, West, Northwest.
|
|
|
|
### `qiblaGreatCircle(lat, lng, steps?): [number, number][]`
|
|
|
|
Generates waypoints along the great circle from [lat, lng] to the Ka'bah using spherical linear interpolation (Slerp). Returns `steps + 1` points (default: 121).
|
|
|
|
Useful for drawing Qibla direction lines on maps.
|
|
|
|
### `distanceKm(lat1, lng1, lat2, lng2): number`
|
|
|
|
Haversine distance between two points in kilometers (spherical Earth approximation, R = 6,371 km).
|
|
|
|
### Constants
|
|
|
|
| Name | Value | Description |
|
|
| ----------------- | --------- | -------------------------------------- |
|
|
| `KAABA_LAT` | 21.422511 | Ka'bah center latitude (degrees north) |
|
|
| `KAABA_LNG` | 39.826150 | Ka'bah center longitude (degrees east) |
|
|
| `EARTH_RADIUS_KM` | 6371 | WGS-84 volumetric mean radius |
|
|
|
|
## Compatibility
|
|
|
|
Node.js 20+. Works in browsers and all major bundlers (Webpack, Vite, Rollup, esbuild). Ships as dual CJS/ESM with full TypeScript definitions.
|
|
|
|
## TypeScript
|
|
|
|
```typescript
|
|
import { qiblaAngle, CompassAbbr, CompassName } from "qibla";
|
|
|
|
const bearing: number = qiblaAngle(40.7128, -74.006);
|
|
```
|
|
|
|
## Related
|
|
|
|
- [pray-calc](https://github.com/acamarata/pray-calc) - Islamic prayer times calculator
|
|
- [nrel-spa](https://github.com/acamarata/nrel-spa) - NREL Solar Position Algorithm
|
|
|
|
## License
|
|
|
|
[MIT](LICENSE)
|