At the beginning of Herodotus’ Histories, the Athenian lawgiver Solon, one of the seven sages of ancient Greece, points out to his interlocutor Croesus, King of Lydia, that if a person lives to be 70, they will experience 26,250 days – by his reckoning the length of a year is 375 days – and that not any two days will be alike.