https://www.hbh-nasu.com/event/ev/%e3%82%bb%e3%83%9f%e3%83%8a%e3%83%bc%e3%83%bb%e8%aa%ac%e6%98%8e%e4%bc%9a 2016-12-21T02:12:25+00:00 weekly 0.3 https://www.hbh-nasu.com/event/ev/diy-class 2024-04-27T08:02:15+00:00 weekly 0.3 https://www.hbh-nasu.com/event/ev/observing 2025-04-17T01:39:46+00:00 weekly 0.3