Solar medium anomaly — sol_medium

Calculates the solar medium anomaly, which is the angular distance of the Earth from its perihelion.

Usage

sol_medium_anomaly(...)

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

# S3 method for class 'weather_station'
sol_medium_anomaly(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 medium anomaly ($M$) is calculated as: $$M = 356.6 + 0.9856 \cdot J$$ where: $J$ is the Julian day.

References

Bendix 2004, p. 243.

Examples

# Calculate solar medium anomaly
sol_medium_anomaly(as.POSIXlt("2022-06-21"))
#> [1] 526.1232