SELECT id, ort, fachwort, (
6368 * SQRT(2*(1-cos(RADIANS(lng)) *
cos(0.18698465771905) * (sin(RADIANS(lat)) *
sin(0.86479292152202) + cos(RADIANS(lat)) *
cos(0.86479292152202)) - sin(RADIANS(lng)) * sin(0.18698465771905)))) AS entfernung
FROM literatur WHERE
6368 * SQRT(2*(1-cos(RADIANS(lng)) *
cos(0.18698465771905) * (sin(RADIANS(lat)) *
sin(0.86479292152202) + cos(RADIANS(lat)) *
cos(0.86479292152202)) - sin(RADIANS(lng)) * sin(0.18698465771905))) <= 25
ORDER BY entfernung