It is an R packages for creating some figures that can be used in an astronomical almanac
As ephem depends on skycalc, which is a wrapper package of the population AA+ library written in Cpp (http://www.naughter.com/aa.html), and need compilation, you must have Rtools (https://cran.r-project.org/bin/windows/Rtools/) installed.
Meanwhile, the R package devtools must also be installed.
install.packages("devtools")devtools::install_github("helixcn/moonsun")
devtools::install_github("helixcn/skycalc")
devtools::install_github("helixcn/ephem")THIS PACKAGE HAS NOT BEEN PEER REVIEWED, USE AT YOUR OWN RISK.
If you have any questions or comments, please feel free to send an email to the package maintainer Dr. Jinlong Zhang .
Jinlong Zhang (2016). ephem: Creating figures for astronomical almanac. R package version 0.X.X. https://github.com/helixcn/ephem