sky.sketch: Create a simplistic sketch of the sky at a given moment in...
In skyscapeR: Data Analysis and Visualization for Skyscape Archaeology

Create a simplistic sketch of the sky at a given moment in time

sky.sketch(
  time,
  timezone,
  calendar,
  xrange = c(30, 150),
  yrange = c(-45, 45),
  sun = T,
  moon = T,
  planets = F,
  exagerate = T,
  max.mag = 6,
  loc,
  atm,
  temp
)

`time`	Either a string containing the date and time in the format "YYYY-MM-DD HH:MM:SS" (see `timestring`), or a numeric containing the julian date (see `time2jd`).
`timezone`	(Optional) Timezone of input either as a known acronym (e.g. "GMT", "CET") or a string with continent followed by country capital (e.g. "Europe/London"). See timezones for details. Only needed if time is a string. If not given the value set by `skyscapeR.vars` will be used instead.
`calendar`	(Optional) Calendar used in parameter time. G for gregorian and J for julian. Only needed if time is a string. If not given the value set by `skyscapeR.vars` will be used instead.
`xrange`	Range of azimuths to display, preferably no larger than 120 degrees.
`yrange`	Range of altitudes to display, preferably no larger than 120 degrees.
`sun`	(Optional) Boolean on whether the sun should be displayed. Defaults to TRUE.
`moon`	(Optional) Boolean on whether the moon should be displayed. Defaults to TRUE.
`planets`	(Optional) Boolean on whether the visible planets should be displayed. Defaults to FALSE.
`exagerate`	(Optional) Boolean on whether the size of the sun, moon and planets should be exaggerated, which can be useful when attempting wider viewing angles. Defaults to TRUE.
`max.mag`	(Optional) Maximum magnitude of stars to consider. Default is 6.
`loc`	Location, either a skyscapeR.object or a vector containing the latitude and longitude of location, in this order.
`atm`	(Optional) Atmospheric pressure for refraction calculation. If not given the value set by `skyscapeR.vars` will be used instead.
`temp`	(Optional) Atmospheric temperature for refraction calculation. If not given the value set by `skyscapeR.vars` will be used instead.