Discipline is equivalent to a constellation for ().

Replace the options one by one.

Item A: Specialty is a part of the discipline, and the two are related. Constellation exists in the universe and constitutes a relationship, but the two words are in the opposite order and the logical relationship is inconsistent, so they are excluded; Item B: Mathematics is a discipline, and both are species-genera. There is no obvious logical relationship between constellation and galaxy, and the logical relationship before and after is inconsistent, so it is excluded; Item C: The discipline is the artificial division of knowledge, and the two correspond, and the constellation is the artificial division of the starry sky, and the two correspond, and the logical relationship is consistent before and after, and they are elected;

Item D: There is no obvious logical relationship between discipline and accumulation, and light year is a unit of length, which has no obvious logical relationship with constellation, so it is excluded. So the correct answer is C.