Bulletin · department
Machinery
The reckoning itself — computus, the Hijri month, the meridian an equinox is dated against. This department explains rather than reports.
-
Nine minutes from midnight in Beijing
The Chinese calendar was being approximated with an average month length. It works until a leap month, and then a hundred and twenty-five dates across twenty-five jurisdictions are wrong, one of them in the wrong year.
-
Where is an equinox?
The March 2027 equinox falls on 20 March in London and 21 March in Tokyo. It is the same instant. We computed it correctly and then dated it in the wrong place, and so does most software that touches this.