Day angle

See a year as a circle. The first day of a (leap) year is 0 degree and the last day 360 degrees.

Usage

sol_day_angle(...)

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

# S3 method for class 'weather_station'
sol_day_angle(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 day angle (\(D\)) is calculated as: $$D = \frac{2\pi(J - 1)}{365}$$ where: \(J\) is the Julian day.

References

Bendix 2004, p. 243.

Examples

# Calculate day angle
sol_day_angle(as.POSIXlt("2022-06-21"))
#> [1] 168.6575