calc_declination_angle: Calculate declination angle as in Yard et al. (2005)

In USGS-R/streamMetabolizer: Models for Estimating Aquatic Photosynthesis and Respiration

Calculate declination angle as in Yard et al. (2005)

Description

Calculate declination angle as in Yard et al. (2005)

Usage

calc_declination_angle(jday, format = c("degrees", "radians"))

Arguments

jday	The day of year as a number between 0 (Jan 1) and 364 (365 also OK for leap year)
format	The format of both the input and the output. May be "degrees" or "radians".

Value

numeric value or vector, in the units specified by format, indicating the declination angle corresponding to each value supplied in jday.

References

Yard, Michael D., Glenn E. Bennett, Steve N. Mietz, Lewis G. Coggins Jr., Lawrence E. Stevens, Susan Hueftle, and Dean W. Blinn. Influence of Topographic Complexity on Solar Insolation Estimates for the Colorado River, Grand Canyon, AZ. Ecological Modelling 183, no. 2-3 (April 25, 2005): 157-72. doi:10.1016/j.ecolmodel.2004.07.027.

Examples

decdf <- data.frame(jday=1:366,
  dec=streamMetabolizer:::calc_declination_angle(1:366))
## Not run: 
library(ggplot2)
ggplot(unitted::v(decdf), aes(x=jday, y=dec)) + geom_line()

## End(Not run)

USGS-R/streamMetabolizer documentation built on Aug. 15, 2023, 7:50 a.m.