In this site have been posted to basic info of astronomy and calendar.(天文や暦に関する基本情報が掲載されています。)
English:Ephemeris Computation Office Public Relations Center NAOJ
In this site have been posted to basic info of astronomy and calendar.(天文や暦に関する基本情報が掲載されています。)
English:Ephemeris Computation Office Public Relations Center NAOJ