SunHA {FAO56}

Sunset Hour Angel (omega_s)

Description

SunHA returns the value of sunset hour angel [rad].

Usage

SunHA(phi, delta)

Arguments

phi

A numeric scalar that denotes the latitude [rad].

delta

A numeric scalar that denotes the solar declination [rad].

Details

This is a function to calculate the sunset hour angel.

Value

The function returns the value of sunset hour angel as a numeric scalar.

Reference

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), D05109.

See Also

SolDec.

Examples

SunHA(phi = -0.35, delta = 0.12)