There is only one constructor function for spherical points.
| spoint( | lng, | |
| lat ); | 
float8 lng;float8 lat;
            where lng is the longitude of the spherical
            point in radians, lng is the latitude of
            the spherical point in radians.
          
Example 4.1. A spherical point from longitude and latitude
Get a spherical position with 270° of longitude and -30° of latitude.
sql> SELECT spoint ( 270.0*pi()/180.0,-30.0*pi()/180.0 ) AS spoint;