1.1 --- a/latlon-v0010.c	Wed Feb 12 12:43:46 2020 +0100
     1.2 +++ b/latlon-v0010.c	Wed Feb 12 13:11:04 2020 +0100
     1.3 @@ -271,12 +271,14 @@
     1.4      if (warn) {
     1.5        ereport(NOTICE, (errmsg("longitude west of 180th meridian normalized")));
     1.6      }
     1.7 -    lon += 360 - trunc(lon / 360) * 360;
     1.8 +    lon = fmod(lon, 360);
     1.9 +    if (lon < -180) lon += 360;
    1.10    } else if (lon > 180) {
    1.11      if (warn) {
    1.12        ereport(NOTICE, (errmsg("longitude east of 180th meridian normalized")));
    1.13      }
    1.14 -    lon -= 360 + trunc(lon / 360) * 360;
    1.15 +    lon = fmod(lon, 360);
    1.16 +    if (lon > 180) lon -= 360;
    1.17    }
    1.18    return lon;
    1.19  }