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The first is\n  // when vectors are aligned (within the bounds of floating point tolerance).\n  // The second is where vectors are antipodal (again within the bounds of\n  // tolerance. Both cases produce a [0, 0, 0] cross product which invalidates\n  // the rest of the algorithm, but each case must be handled separately:\n  // - The aligned case indicates coincidence of A and B. therefore this can be\n  //   an early return assuming the closest point is the end (for consistency).\n  // - The antipodal case is truly degenerate - an infinte number of great\n  //   circles are possible and one will always pass through C. However, given\n  //   that this case is both highly unlikely to occur in practice and that is\n  //   will usually be logically sound to return that the point is on the\n  //   segment, we choose to return the provided point.\n  if (segmentAxis[0] === 0 && segmentAxis[1] === 0 && segmentAxis[2] === 0) {\n    if (dot(A, B) > 0) {\n      return [[...posB], true];\n    } else {\n      return [[...posC], false];\n    }\n  }\n\n  // The axis of the great circle passing through the segment's axis and the\n  // target point\n  const targetAxis = cross(segmentAxis, C);\n\n  // This cross product also has a degenerate case where the segment axis is\n  // coincident with or antipodal to the target point. In this case the point\n  // is equidistant to the entire segment. For consistency, we early return the\n  // endpoint as the matching point.\n  if (targetAxis[0] === 0 && targetAxis[1] === 0 && targetAxis[2] === 0) {\n    return [[...posB], true];\n  }\n\n  // The line of intersection between the two great circle planes\n  const intersectionAxis = cross(targetAxis, segmentAxis);\n\n  // Vectors to the two points these great circles intersect are the normalized\n  // intersection and its antipodes\n  const I1 = normalize(intersectionAxis);\n  const I2: Vector = [-I1[0], -I1[1], -I1[2]];\n\n  // Figure out which is the closest intersection to this segment of the great circle\n  // Note that for points on a unit sphere, the dot product represents the\n  // cosine of the angle between the two vectors which monotonically increases\n  // the closer the two points are together and therefore determines proximity\n  const I = dot(C, I1) > dot(C, I2) ? 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