本日 2026年5月26日(火) 19:14 Etc/GMT-9

2026/06/20 21:00~2026/06/21 21:00

World Hydrography Day

http://www.iho.int/srv1/index.php?option=com_content&view=article&id=380&Itemid=296&lang=enhttp://www.iho.int/mtg_docs/WHD/2018/WHD2018Backgroundbrief.pdfhttps://en.wikipedia.org/wiki/World_Hydrography_DayEmail your celebration plans to jan@surveyspatialnz.org