Solar elevation angle

Usage

sol_elevation(...)

# Default S3 method
sol_elevation(datetime, lon, lat, ...)

# S3 method for class 'weather_station'
sol_elevation(weather_station, ...)

Arguments

...: Named station fields, site parameters or model assumptions.
datetime: POSIXlt or POSIXct date-time vector.
lon: Longitude in degrees.
lat: Latitude in degrees.
weather_station: A weather_station object.

Value

Degree.

Details

The solar elevation angle ($h$) is the apparent angle of the sun above the horizon. It is calculated as: $$h = \arcsin(\sin(\phi) \cdot \sin(\delta) + \cos(\phi) \cdot \cos(\delta) \cdot \cos(H))$$ where: $\phi$ is the latitude, $\delta$ is the solar declination, and $H$ is the hour angle.

References

Bendix 2004, p. 243.

Examples

# Calculate solar elevation angle
sol_elevation(as.POSIXlt("2022-06-21"), lon = 10, lat = 50)
#> [1] -16.56115