### Question --- What are the Oort A and B coefficients and what basic information about the Galaxy can be determined from them? What are the four types of observations that go into constraining these coefficients, and how precisely are each measured by current technology. ### Answer --- ##### What are the Oort A and B coefficients and what basic information about the Galaxy can be determined from them? ![[Oort Constants#Overview]] > [!derivation]- > ![[Oort Constants#Derivation]] ##### What are the four types of observations that go into constraining these coefficients, and how precisely are each measured by current technology. ![[Oort Constants#Measurements]]