Passages in the works of Homer and Hesiod indicated that the Greeks had used lunar months. Hesiod, in chi ro iota Works and Days, had also shown that he often used the constellations to plan when to plant and harvest crops. The lunar and solar systems were used in the Greek calendar.
Sometimes, extra days were added, while at other time they were omitted. This can make the calendar difficult to determine each year. It appeared that the name of each month was normally named after its main festivals. You will find more detail about the festivals in the next article, titled Greek Festivals.