What's the name of Tianjin IV? What does it have to do with Cowherd and Weaver Girl?

Tianjin IV is also called "Altair" or "Polaris".

Cygnus alpha star Tianjin IV is the west star of Tianjin IV and one of the three brightest stars in the northern sky. Together with Vega and Altair, it is called "Weaver Samsung".

According to an ancient legend in China, Cowherd and Weaver Girl can only meet on Tanabata every year across the Milky Way. The size of Tianjin is regarded as their "bridge", that is, the medium connecting the cowherd and the weaver girl. In reality, the shape of Tianjin IV is not like a star, but more like a pole. Therefore, in China, Tianjin IV is also called "North Star".

I hope the above answers can help you.