azimuth_angle: Azimuth Angle

In TrenchR: Tools for Microclimate and Biophysical Ecology

Azimuth Angle

Description

The function calculates the azimuth angle, the angle (degrees) from which the sunlight is coming measured from true north or south measured in the horizontal plane. The azimuth angle is measured with respect to due south, increasing in the counter clockwise direction so 90 degrees is east \insertCiteCampbell1998TrenchR.

Usage

azimuth_angle(doy, lat, lon, hour, offset = NA)

Arguments

doy	numeric day of year (1-366). This can be obtained from standard date via day_of_year.
lat	numeric latitude (decimal degrees).
lon	numeric longitude (decimal degrees).
hour	numeric hour of the day.
offset	numeric number of hours to add to UTC (Coordinated Universal Time) to get local time (to improve accuracy but not always necessary). Optional. Defaults to NA.

Value

numeric azimuth angle (degrees).

References

\insertAllCited

See Also

Other utility functions: airpressure_from_elev(), day_of_year(), daylength(), dec_angle(), solar_noon(), temperature conversions, zenith_angle()

Examples

  azimuth_angle(doy    = 112, 
                lat    = 47.61, 
                lon    = -122.33, 
                hour   = 12, 
                offset = -8)

TrenchR documentation built on Sept. 14, 2023, 1:07 a.m.