We have 小暑=shou-sho, the 5th of summer 二十四節気 today while also 七夕=tanabata, when 織姫=orihime and 牽牛=kengyu meet at night across the Milky Way. Since Mei-Shun often confuse 天の川 with 銀河, she checked up these words online. They say solar system is included in 天の川銀河 or 銀河系. However, there are a lot of the latter according to Shin.