R shiny app to draw sun and moon traces

The video shows an "R shiny app" I wrote to trace the paths of sun and moon
through the sky. To run this yourself, download the R code from
gist.github.co...
and run it in Rstudio or any other system that runs the R language. You will
need to install some packages that are on CRAN, including oce, shiny,
lubridate, and bslib.