Golf ball 2 has numerous dimples 8 . The surface of the golf ball is divided by comparting lines CM corresponds to edges of a regular icosahedron into eight first spherical regular triangles T 1 , six second spherical regular triangles T 2 , and six third spherical regular triangles T 3 . The first spherical regular triangles T 1 do not include the equatorial line EQ. The second spherical regular triangles T 2 and the third spherical regular triangles T 3 include the equatorial line EQ. The dimple pattern on the first spherical regular triangle T 1 is different from the dimple patterns on the second spherical regular triangle T 2 and third spherical regular triangle T 3 . The dimple pattern on the first spherical regular triangle T 1 has rotational symmetry and line symmetry. The dimple pattern on the second spherical regular triangle T 2 and the third spherical regular triangle T 3 has neither a rotational symmetry nor line symmetry. This golf ball 2 does not have any great circle path.
1. A golf ball having numerous dimples on the surface thereof, wherein
the golf ball does not have a great circle which does not intersect with the dimple,
when a phantom spherical surface thereof is comparted by thirty comparting lines, being formed by projecting thirty edges of a regular icosahedron inscribed in the phantom spherical surface on the phantom spherical surface, into spherical regular icosahedrons consisting of multiple spherical regular triangles including the equatorial line and multiple spherical regular triangles not including the equatorial line, the dimple pattern on the spherical regular triangle not including the equatorial line being different from the dimple pattern on the spherical regular triangle including the equatorial line, and
the golf ball comprises twelve spherical regular triangles including the equatorial line, and eight spherical regular triangles not including the equatorial line.
2. The golf ball according to claim 1 , wherein
at all twelve vertices of the spherical regular icosahedrons, there exists a dimple the center of which agrees with the corresponding vertex, and
all the spherical regular triangles have six or more dimples the center of which agrees with the comparting line, respectively.
3. The golf ball according to claim 1 , wherein the number of types of the dimples on one spherical regular triangle including the equatorial line is different from the number of types of the dimples on one spherical regular triangle not including the equatorial line.
4. The golf ball according to claim 3 , wherein the number of types of the dimples on the one spherical regular triangle including the equatorial line is greater than the number of types of the dimples on the one spherical regular triangle not including the equatorial line.
5. The golf ball according to claim 1 , wherein the dimple pattern on the spherical regular triangle including the equatorial line has neither rotational symmetry nor line symmetry.
6. The golf ball according to claim 1 , comprising a spherical regular triangle including the equatorial line and having a certain dimple pattern, and a spherical regular triangle including the equatorial line and having other dimple pattern, wherein the certain dimple pattern is different from the other dimple pattern.
7. The golf ball according to claim 1 , comprising a spherical regular triangle not including the equatorial line and having a certain dimple pattern, and a spherical regular triangle not including the equatorial line and having other dimple pattern, wherein the certain dimple pattern is different from the other dimple pattern.