Hesiod, The Homeric Hymns, and Homerica
Page: 35(ll. 819-821) On the fourth day open a jar. The fourth of the mid-month is a day holy above all. And again, few men know that the fourth day after the twentieth is best while it is morning: towards evening it is less good.
(ll. 822-828) These days are a great blessing to men on earth; but the rest are changeable, luckless, and bring nothing. Everyone praises a different day but few know their nature. Sometimes a day is a stepmother, sometimes a mother. That man is happy and lucky in them who knows all these things and does his work without offending the deathless gods, who discerns the omens of birds and avoids transgressions.
THE DIVINATION BY BIRDS (fragments)
Proclus on Works and Days, 828: Some make the "Divination by Birds", which Apollonius of Rhodes rejects as spurious, follow this verse ("Works and Days", 828).
THE ASTRONOMY (fragments)