R/CP1919.R

In coolbutuseless/CP1919: Eighty Successive Periods of the First Pulsar Observed, CP1919

#' Cambridge Pulsar 19 hours 19 minutes right ascension
#'
#' EIGHTY SUCCESSIVE PERIODS of the first pulsar observed, CP1919
#' (Cambridge pulsar at 19 hours 19 minutes right ascension), are
#' stacked on top of one another using the average period of 1.33730
#' seconds in this computer-generated illustration produced at the
#' Arecibo Radio Observatory in Puerto Rico. Although the leading edges
#' of the radio pulses occur within a few thousandths of a second of
#' the predicted times, the shape of the pulses is quite irregular.
#' Some of this irregularity in radio reception is caused by the
#' effects of transmission through the interstellar medium.
#' The average pulse width is less than 50 thousandths of a second."
#'
#' From "The Nature of Pulsars," by Jeremiah P. Ostriker, Scientific American, January 1971.
#'
#' @format A data frame with 5063 rows and 3 variables:
#' \describe{
#'   \item{line}{line index starting from the back. Each line represents one period of the pulsar.}
#'   \item{x}{x coord}
#'   \item{y}{y coord}
#' }
#' @source \url{http://blogs.scientificamerican.com/sa-visual/pop-culture-pulsar-origin-story-of-joy-division-8217-s-unknown-pleasures-album-cover-video/}
"CP1919"