The "distance" function should be this:
distance_function = (
(6371
* func.acos(func.cos(func.radians(bindparam('origin_lat')))
* func.cos(func.radians(places_table.c.latitude))
* func.cos(func.radians(places_table.c.longitude) -
func.radians(bindparam('origin_lng'))
)
+ func.sin(func.radians(bindparam('origin_lat')))
* func.sin(func.radians(places_table.c.latitude))
)
)
)
(We're taking the acos of the whole shebang, not just the "origin_lat")
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