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- plot_parallactic

# plot_parallactic

`astroplan.plots.``plot_parallactic`(target, observer, time, ax=None, style_kwargs=None, style_sheet=None)

  Plots parallactic angle as a function of time for a given target.

  If a `Axes` object already exists, an additional parallactic angle plot will be “stacked” on it. Otherwise, creates a new `Axes` object and plots on top of that.

  When a scalar `Time` object is passed in (e.g., `Time('2000-1-1')`), the resulting plot will use a 24-hour window centered on the time indicated, with parallactic angle sampled at regular intervals throughout. However, the user can control the exact number and frequency of parallactic angle calculations used by passing in a non-scalar `Time` object. For instance, `Time(['2000-1-1 23:00:00', '2000-1-1 23:30:00'])` will result in a plot with only two parallactic angle measurements.

  For examples with plots, visit the documentation of Time Dependent Plots.

  Parameters
    target `FixedTarget`

      The celestial body of interest.

    observer `Observer`

      The person, telescope, observatory, etc. doing the observing.

    time `Time`

      If scalar (e.g., `Time('2000-1-1')`), will result in plotting target parallactic angle once an hour over a 24-hour window. If non-scalar (e.g., `Time(['2000-1-1'])`, `[Time('2000-1-1')]`, `Time(['2000-1-1', '2000-1-2'])`), will result in plotting data at the exact times specified.

    ax `Axes` or None, optional.

      The `Axes` object to be drawn on. If None, uses the current `Axes`.

    style_kwargs dict or None, optional.

      A dictionary of keywords passed into `plot_date` to set plotting styles.

    style_sheet dict or `None` (optional)

      matplotlib style sheet to use. To see available style sheets in astroplan, print astroplan.plots.available_style_sheets. Defaults to the light theme.

  Returns
    ax `Axes`

      An `Axes` object with added parallactic angle vs. time plot.