daylength {TrenchR}

R Documentation

Day Length

Description

The function calculates daylength in hours as a function of latitude and day of year. Uses the CMB model (Campbell and Norman 1998).

Usage

daylength(lat, doy)

Arguments

lat	numeric latitude (decimal degrees).
doy	numeric day of year (1-366). This can be obtained from standard date via day_of_year.

Value

numeric day length (hours).

References

Campbell GS, Norman JM (1998). Introduction to environmental biophysics, 2nd ed. edition. Springer, New York. ISBN 0387949372.

See Also

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

Examples

  daylength(lat = 47.61, 
            doy = 112)

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