This is a distribution of iCalendar files for the sunrise and sunset times of:
- All the prefectures in Japan
- All the countries and regions in the world
世界の首都の位置データ Location Data of World Capitals: https://amano-tec.com/data/world.html
日本の東西南北端点の経度緯度 https://www.gsi.go.jp/KOKUJYOHO/center.htm