Galactic and Equatorial Coordinate Implementation for 'ggplot2'

Simple tools to draw sky maps in 'ggplot2' using galactic or equatorial coordinates. Includes custom coordinate systems, grid labels, and helpers for sky map breaks.

ggsky

ggsky is an extension for ggplot2 to draw sky maps with:

• galactic coordinates (coord_galactic())
• equatorial coordinates (coord_equatorial())

It includes custom coordinate systems and helper scales for longitude/latitude labels.

Installation

From GitHub:

remotes::install_github("uskovgs/ggsky")

Quick examples

  library(ggplot2)
  library(ggsky)

  N <- 100
  df1 <- data.frame(
    x = runif(N, 0, 360),
    y = runif(N, -90, 90)
  )

  ggplot(df1, aes(x, y)) +
    geom_point() +
    coord_galactic() +
    labs(title = "Galactic coordinate system")

  ggplot(df1, aes(x, y)) +
    geom_point() +
    labs(title = "Equatorial coordinate system") +
    coord_equatorial()