Hi Boba! This persistent individual would be waiting for a while as the Mayor is very busy preparing for the upcoming Founder's Day. However, eventually he would be able to respond that the solar eclipse sure is a wild experience and be delighted that someone compared it to a dome before happily recommending some websites for build-your-own eclipse viewers.

Basically, NPCs still are amazed by the solar eclipse and don't notice it's an actual dome and this includes the mayor. Hope this helps!