Solar declination

Solar declination

Usage

sol_declination(...)

# Default S3 method
sol_declination(datetime, ...)

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

Arguments

...

Named station fields, site parameters or model assumptions.

datetime

POSIXlt or POSIXct date-time vector.

weather_station

A weather_station object.

Value

Degree.

Details

The solar declination (\(\delta\)) is the angle between the rays of the sun and the plane of the Earth's equator. It is calculated as: $$\delta = \arcsin(\sin(23.44^\circ) \cdot \sin(L))$$ where: \(L\) is the ecliptic longitude.

References

Bendix 2004, p. 243.

Examples

# Calculate solar declination
sol_declination(as.POSIXlt("2022-06-21"))
#> [1] 23.43806