declination: Solar declination
In WDNR-Water-Use/CSLSevap: Evapo(transpi)ration Calculations
Description
Usage
Arguments
Value
References
View source: R/radiation_functions.R
Description
Calculates the solar declination (radians) using Equation 24 from Allen et
al. (1998). Similar to Equation 2.1 in Harwell (2012), but with some rounding
differences.
Usage
1
declination(J)
Arguments
J
Julian day, i.e., the number of the day in the year between 1 (1
January) and 365 or 366 (31 December).
Value
delta
solar declination (radians)
References
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop
evapotranspiration: Guidelines for computing crop water requirements. Rome:
FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
Harwell, G.R., 2012, Estimation of evaporation from open water—A
review of selected studies, summary of U.S. Army Corps of Engineers data
collection and methods, and evaluation of two methods for estimation of
evaporation from five reservoirs in Texas: U.S. Geological Survey
Scientific Investigations Report 2012–5202, 96 p.
WDNR-Water-Use/CSLSevap documentation built on April 9, 2021, 1:35 a.m.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Description Usage Arguments Value References
View source: R/radiation_functions.R
Description
Calculates the solar declination (radians) using Equation 24 from Allen et al. (1998). Similar to Equation 2.1 in Harwell (2012), but with some rounding differences.
Usage
1 | declination(J)
|
Arguments
J |
Julian day, i.e., the number of the day in the year between 1 (1 January) and 365 or 366 (31 December). |
Value
delta |
solar declination (radians) |
References
Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration: Guidelines for computing crop water requirements. Rome: FAO. Retrieved from http://www.fao.org/docrep/X0490E/x0490e00.htm.
Harwell, G.R., 2012, Estimation of evaporation from open water—A review of selected studies, summary of U.S. Army Corps of Engineers data collection and methods, and evaluation of two methods for estimation of evaporation from five reservoirs in Texas: U.S. Geological Survey Scientific Investigations Report 2012–5202, 96 p.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
Embedding an R snippet on your website
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.