[PROJ] WGS84(Natural Earth data) to sphere

[Gonzo Bard]

Greetings to all!

I use Natural Earth data:  https://www.naturalearthdata.com/downloads/
> All Natural Earth data use the Geographic coordinate system (projection),
WGS84 datum
That is, Natural Earth data are points on an ellipsoid.

To display geographical data on the map, I pre-convert it from Shapefile to
GeoJSON.
To do this, I use the ogr2ogr program (GDAL library).
In ogr2ogr there are conversion options:
from -s_srs https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-s_srs
to -t_srs https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-t_srs.

If I understood correctly, the GDAL project uses OSGeo / PROJ as a
projection library.

Please tell me what the values for -s_srs and -t_srs should be in order to
perform the conversion:
points located on an ellipsoid (WGS84 datum) ===> to points located on a
sphere?
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