Solar hour angle — sol_hour_angle • fieldClim

Calculates the solar hour angle, which is the measure of time since solar noon in degrees.

Usage

sol_hour_angle(...)

# Default S3 method
sol_hour_angle(datetime, lon, ...)

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

Arguments

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

Value

Degree.

Details

The solar hour angle ($H$) is calculated as: $$H = 15 \cdot (T_m + E_t - 12)$$ where: $T_m$ is the solar medium suntime, $E_t$ is the solar time formula.

References

Bendix 2004, p. 243.

Examples

# Calculate solar hour angle
sol_hour_angle(as.POSIXlt("2022-06-21 12:00:00"), lon = 10)
#> [1] 0.3840178