50.0 + 143.2394488 * (2.238026669-(위도*pi / 180)) * sin(0.497465385 * (경도 - 50) * pi / 180) * 0.654
50 - 143.2394488 * (1.714427893 - (2.238026669-(위도*pi / 180)) * cos(0.497465385 * (경도 - 50) * pi / 180))