SELECT id, ort, fachwort, (
6368 * SQRT(2*(1-cos(RADIANS(lng)) *
cos(0.20159774591011) * (sin(RADIANS(lat)) *
sin(0.8363792308482) + cos(RADIANS(lat)) *
cos(0.8363792308482)) - sin(RADIANS(lng)) * sin(0.20159774591011)))) AS entfernung
FROM literatur WHERE
6368 * SQRT(2*(1-cos(RADIANS(lng)) *
cos(0.20159774591011) * (sin(RADIANS(lat)) *
sin(0.8363792308482) + cos(RADIANS(lat)) *
cos(0.8363792308482)) - sin(RADIANS(lng)) * sin(0.20159774591011))) <= 25
ORDER BY entfernung