from pygreatcircledistance import haversine_formula, spherical_law_of_cosines_formula, vincenty_formula

from_coords = (77.1539, -120.398)
to_coords = (77.1804, 129.55)

# Haversine formula: simpler and faster but less accurate for long distances and near the poles. Assumes a perfect sphere.
dist_haversine = haversine_formula(from_coords, to_coords)
print(f"Haversine formula distance: {dist_haversine} meters")

# Spherical Law of Cosines formula: more accurate than the Haversine formula for long distances but still assumes a perfect sphere.
dist_spherical_cosines = spherical_law_of_cosines_formula(from_coords, to_coords)
print(f"Spherical Law of Cosines formula distance: {dist_spherical_cosines} meters")

# Vincenty formula: the most accurate as it takes into account the ellipsoidal shape of the Earth. More computationally intensive.
dist_vincenty = vincenty_formula(from_coords, to_coords)
print(f"Vincenty formula distance: {dist_vincenty} meters")