TrenchR (version 1.1.1)

zenith_angle: Zenith Angle

Description

The function calculates the zenith angle, the location of the sun as an angle (in degrees) measured from vertical Campbell1998TrenchR.

Usage

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

Value

numeric zenith angle (degrees)

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 (0-24).

offset

numeric the number of hours to add to UTC (Coordinated Universal Time) to get local time (improves accuracy but not always necessary). Optional. Defaults to NA.

References

See Also

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

Examples

  zenith_angle(doy  = 112, 
               lat  = 47.61, 
               lon  = -122.33, 
               hour = 12)