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== hsin, ghhsin  Haversine Formula ==
[[Solr1.5]] See: https://issues.apache.org/jira/browse/SOLR1302
 The Haversine distance calculates the distance between two points on a sphere when traveling
along the sphere. In other words, it's the Great Circle distance. See http://en.wikipedia.org/wiki/Greatcircle_distance.
In the case of GeohashHaversine, the sources must be a geohash value.
+ The Haversine distance calculates the distance between two points on a sphere when traveling
along the sphere. In other words, it's the Great Circle distance. See http://en.wikipedia.org/wiki/Greatcircle_distance.
In the case of !GeohashHaversine, the sources must be a geohash value.
 '''Values must be in Radians'''. Please note Haversine distance has known problems with
antipodal values. See the Wiki page.
+ '''Values must be in Radians'''. See the rad() function. Please note Haversine distance
has known problems with antipodal values. See the Wikipedia page for details.
Signature: hsin(x1,y1,x2,y2, radius), ghhsin(hash1, hash2, radius)
 Example: hsin(x, y, 0, 0, 1)  Calculate the haversin distance between the lat/lon 0, 0
and the values in field x,y with a radius of 1.
+ Example: hsin(x, y, 0, 0, 1)  Calculate the haversine distance between the lat/lon 0, 0
and the values in field x,y with a radius of 1.
== geohash  Convert to geohash ==
Given a latitude and longitude (in degrees, not radians), convert them to a Geohash. See
http://en.wikipedia.org/wiki/Geohash.
