cal_solarDeclination {simET}

Calculating solar declination

Description

Calculating solar declination

Usage

cal_solarDeclination(td)

Arguments

td

is the day of year.

Value

A vector for solar declination (Radian)

Note

The solar declination actually varies throughout the day too but its variation is very small; thus, it is often ignored. Negative angles occur when the angle is below the equator plane, positive for above the equator.

References

Teh CBS.Introduction to mathematical modeling of crop growth: How the equations are derived and assembled into a computer model. Brown Walker Press, 2006.

Examples

cal_solarDeclination(34)