Assertion: moon's day | /r/HasProperty | followed by ten prytanies of 27 days
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text: In the Thirteen Phylai period (224/223 – 201/200 BC), it would be expected that in an intercalary year prytanies and months must have been fairly evenly matched and that in an ordinary year, the conciliar year was made up of three prytanies of 28 days followed by ten prytanies of 27 days, but there is strong evidence that the first prytany had usually 27 days.