I want to know the answer to the following question:
Heian was Japan's capital for how many years?
All the background I'm provided with is that "When Emperor Kammu moved the capital to Heian-kyō (Kyōto), which remained the imperial capital for the next 1,000 years, he did so not only to strengthen imperial authority but also to improve his seat of government geopolitically.". Is that enough to answer the question?
Answer: yes