In Ojai, a small California town better known for its light than its stock listings, Rachel Lang lives two improbable lives. Part of the week she reads clients as a professional astrologer. The rest she governs, as an elected member of the city council. In between, she picks stocks by the planets. Lang, an author, has spent more than a decade reading the markets the way she reads a person, by their chart. Since 2019, she claims, the portfolio sh…