nrel-spa/.github/wiki/api/functions/getSpa.md
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[**nrel-spa v2.0.2**](../README.md)
***
[nrel-spa](../README.md) / getSpa
# Function: getSpa()
## Call Signature
> **getSpa**(`date`, `latitude`, `longitude`, `timezone?`, `options?`): [`SpaResult`](../interfaces/SpaResult.md)
Defined in: [index.ts:145](https://github.com/acamarata/nrel-spa/blob/dea28b9262311319e14e8b9f29cb072ae4aea635/src/index.ts#L145)
Compute solar position for the given parameters.
### Parameters
#### date
`Date`
JavaScript Date object (uses UTC components)
#### latitude
`number`
Observer latitude in degrees (-90 to 90, negative = south)
#### longitude
`number`
Observer longitude in degrees (-180 to 180, negative = west)
#### timezone?
`number` \| `null`
Hours from UTC (e.g., -4 for EDT). Default: 0
#### options?
[`SpaOptions`](../interfaces/SpaOptions.md) \| `null`
Optional atmospheric and calculation parameters
### Returns
[`SpaResult`](../interfaces/SpaResult.md)
Solar position result with raw numerical values
### Throws
If date, latitude, longitude, timezone, or options numeric fields are not finite numbers
### Throws
If latitude, longitude, timezone, function code, or angle values are out of range
### See
[Wiki: getSpa](https://github.com/acamarata/nrel-spa/wiki/api/getSpa)
## Call Signature
> **getSpa**(`date`, `latitude`, `longitude`, `timezone`, `options`, `angles`): [`SpaResultWithAngles`](../interfaces/SpaResultWithAngles.md)
Defined in: [index.ts:163](https://github.com/acamarata/nrel-spa/blob/dea28b9262311319e14e8b9f29cb072ae4aea635/src/index.ts#L163)
Compute solar position and resolve custom zenith angles (e.g., twilight).
### Parameters
#### date
`Date`
JavaScript Date object (uses UTC components)
#### latitude
`number`
Observer latitude in degrees (-90 to 90, negative = south)
#### longitude
`number`
Observer longitude in degrees (-180 to 180, negative = west)
#### timezone
`number` \| `null` \| `undefined`
Hours from UTC (e.g., -4 for EDT). Default: 0
#### options
[`SpaOptions`](../interfaces/SpaOptions.md) \| `null` \| `undefined`
Atmospheric and calculation parameters (pass null for defaults)
#### angles
\[`number`, `...number[]`\]
Custom zenith angles in degrees. Common: 96 civil, 102 nautical, 108 astronomical
### Returns
[`SpaResultWithAngles`](../interfaces/SpaResultWithAngles.md)
Solar position result including an angles array