ws {MeTo}

Sunset hour angle

Description

Sunset hour angle for given latitude and solar declination (SolarDec).

Usage

ws(x, lat.rad)

Arguments

x

date-time object or day of the year

lat.rad

latitude [rad]

Details

x:

must be provided as number (1-366) or as a common date-time object (e.g, POSIXct, POSIXlt or Date objects). All formats for which is.timepoint from the lubridate package returns TRUE can be used

Value

Sunset hour angle

Note

eq. 25 of reference

References

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. FAO, Rome, 300(9).

Examples

ws(x = 246, lat.rad = -0.35)