from the manual [1]

-----------------
At the moment the elevation and maximum distance must be measured in meters,
even if you use geographical coordinates (longitude/latitude). If your
projection is based on distance (easting and northing), these too must be in
meters. The buffer parameters must be in the same units as the raster
coordinates (e.g., for latitude-longitude locations buffers are measured in
degree unit)
----------------

 your first report was a module run within a latlon location; check the
buffer option is in the right unit


[1] https://grass.osgeo.org/grass72/manuals/r.horizon.html



-----
best regards
Helmut
--
Sent from: http://osgeo-org.1560.x6.nabble.com/Grass-Users-f3884509.html
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