Nixie footprint

I had a short peek at a datasheet for that. Apparently the pins are on a circle with a radius of 11mm, pin spacing is regular (those 27.7 degrees) and thus not a full circle.

KiCad can display polar coordinates:

But this does not seem to work for pad placement. You can generate a circular array (First place one pad, then right mouse button popup and: Create from Selection / Create Array.

Lines can be set with polar coordinates. So one option is to:

  1. Draw some lines with the right length and angle.
  2. Snap the grid origin to an endpoint of a line (Snapping system is a bit complicated in KiCad).
  3. Place a pad at that location.
  4. Repeat for the other pads.

This little test fitting tutorial I wrote 7 years ago may also be of interest:

I had a little peek at: Footprint Editor / File / Create Footprint / Circular Pad Array and created the screenshot below, But from what I can see, it always assumes the pads are on a full circle. I don’t see a start and end angle as retiredfeline implied.