'd', terminator_datetime=None, *, frame=None, fill=None, projection=None, region=None, timestamp=None, verbose=None, pen=None, xshift=None, yshift=None, panel=None, perspective=None, transparency=None, **kwargs)

Plot day-light terminators or twilights.

This function plots the day-night terminator. Alternatively, it can plot the terminators for civil twilight, nautical twilight, or astronomical twilight.

Full parameter list at


  • B = frame

  • G = fill

  • J = projection

  • R = region

  • U = timestamp

  • V = verbose

  • W = pen

  • X = xshift

  • Y = yshift

  • c = panel

  • p = perspective

  • t = transparency

  • terminator (str) –

    Set the type of terminator displayed. Valid arguments are day_night, civil, nautical, and astronomical, which can be set with either the full name or the first letter of the name. [Default is day_night]

    Refer to for the definitions of different types of twilight.

  • terminator_datetime (str or datetime object) – Set the UTC date and time of the displayed terminator. It can be passed as a string or Python datetime object. [Default is the current UTC date and time]

  • region (str or list) – Required if this is the first plot command. xmin/xmax/ymin/ymax[+r][+uunit]. Specify the region of interest.

  • projection (str) – Required if this is the first plot command. projcode[projparams/]width. Select map projection.

  • frame (bool or str or list) – Set map boundary frame and axes attributes.

  • fill (str) – Color or pattern for filling of terminators.

  • pen (str) – Set pen attributes for lines. The default pen is default,black,solid.

  • timestamp (bool or str) – Draw GMT time stamp logo on plot.

  • verbose (bool or str) –

    Select verbosity level [Default is w], which modulates the messages written to stderr. Choose among 7 levels of verbosity:

    • q - Quiet, not even fatal error messages are produced

    • e - Error messages only

    • w - Warnings [Default]

    • t - Timings (report runtimes for time-intensive algorithms);

    • i - Informational messages (same as verbose=True)

    • c - Compatibility warnings

    • d - Debugging messages

  • xshift (str) – [a|c|f|r][xshift]. Shift plot origin in x-direction.

  • yshift (str) – [a|c|f|r][yshift]. Shift plot origin in y-direction. Full documentation is at

  • panel (bool or int or list) – [row,col|index]. Selects a specific subplot panel. Only allowed when in subplot mode. Use panel=True to advance to the next panel in the selected order. Instead of row,col you may also give a scalar value index which depends on the order you set via autolabel when the subplot was defined. Note: row, col, and index all start at 0.

  • perspective (list or str) – [x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0]. Select perspective view and set the azimuth and elevation angle of the viewpoint. Default is [180, 90]. Full documentation is at

  • transparency (int or float) – Set transparency level, in [0-100] percent range. Default is 0, i.e., opaque. Only visible when PDF or raster format output is selected. Only the PNG format selection adds a transparency layer in the image (for further processing).

Examples using