Earth coastline data: Natural Earth 1:110m land polygons, distributed by
world-atlas 2.0.2 and converted from TopoJSON to GeoJSON. Coordinates have been
rounded to three decimal places for this full-globe display. This drawing is
not an elevation model and does not determine the astronomical calculations.

Natural Earth data is in the public domain:
https://www.naturalearthdata.com/about/terms-of-use/

world-atlas: https://github.com/topojson/world-atlas
Copyright 2013-2019 Michael Bostock

Permission to use, copy, modify, and/or distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright notice
and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
