astroplan.plots.plot_parallactic(target, observer, time, ax=None, style_kwargs=None, style_sheet=None)[source]#

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.


The celestial body of interest.


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


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.

axAxes or None, optional.

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

style_kwargsdict or None, optional.

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

style_sheetdict 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.


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