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The python utility is called, and is located in a scripts directory of your installation.

CASA <> execfile(".../")
CASA <> util=simutil()
CASA <> util<TAB>


Returns the average of directions as a string, and relative offsets
simutil.calc_pointings(spacing, imsize, cell, direction=None, relmargin=0.5)
If direction is a list, simply returns direction and the number of pointings in it. Otherwise, returns a hexagonally packed list of pointings separated by spacing and fitting inside an image specified by direction, imsize and cell, and the number of pointings. The hexagonal packing starts with a horizontal row centered on direction, and the other rows alternate being horizontally offset by a half spacing. All of the pointings will be within a rectangle relmargin * spacing smaller than the image on all sides.
simutil.ephemeris(date, direction=None, telescope=None)
calculate the elevation of a source on a date, in a direction, seen from a telescope

For more detailed examples, find the python script for the simdata task, which is a file called in your distribution.