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- The Mauryan Empire was at the height of its power.
- 238 BC: Ptolemy III. Euergetes of Egypt leads with his Canopus decree a one leap day for every fourth calendar year. The leap is the sixth Epagomen tag at the end of the year. After some time, this scheme will be abolished by the politically strengthened priesthood again. Only from Sosigenes of Alexandria this ( reasonable ) control is taken up again and made usable for ( " Julian " ) calendar reform Gaius Julius Caesar in 46 BC.