令和開始図
https://www.pixiv.net/artworks/74207238
2020までの日本春分図
http://www.iprema.net/chart/equinox2001.html
2020中国春分図
https://www.pixiv.net/artworks/79529538
2020台湾春分図
https://www.pixiv.net/artworks/78913002
2020米国春分図
https://www.pixiv.net/artworks/79483821
2020イラン春分図
https://www.pixiv.net/artworks/78998594
2020新月・満月時刻表
https://www.hottatakeshi.com/moon.html