ERROR:  input is out of range
CONTEXT:  SQL function "gc_dist1" statement 1

create or replace function gc_dist1(_lat1 float8, _lon1 float8, _lat2 float8, _lon2 float8)
returns float8 as $$
select ACOS(SIN(radians($1))*SIN(radians($3))+COS(radians($1))*COS(radians($3))*COS(radians($4)-radians($2)))*6371;
$$ language sql immutable;

select gc_dist1(24.6269989013672,59.3357849157094,24.6269989013672,59.3357849121094);