Εἰκοστή/ Εἰκὰς/ Εἰκοσάδες, XX day
From today’s sunset: twentieth day of Mounychion.
Sacred Εἰκὰς: the twentieth of each month is always sacred to Apollo and Athena. Monthly festival dedicated to Lord Apollo.
Sacrifice to Leucaspis (calendar of Erchia)
"While Heracles was making the circuit of Sicily at this time he came to the city which is now Syracuse, and on learning what the myth relates about the Rape of Corê he offered sacrifices to the Goddesses on a magnificent scale, and after dedicating to Her the fairest bull of his herd and casting it in the spring Cyanê, he commanded the natives to sacrifice each year to Corê and to conduct at Cyanê a festive gathering and a sacrifice in splendid fashion. He then passed with his cattle through the interior of the island, and when the native Sicani opposed him in great force, he overcame them in a notable battle and slew many of their number, among whom, certain writers of myths relate, were also some distinguished generals who receive the honours accorded to Heroes even to this day, such as Leucaspis, Pediacrates, Buphonas, Glychatas, Bytaeas, and Crytidas.
Diod. Sic. IV 23
"On the great twentieth, in full day, a wise man should be born. Such a one is very sound-witted."
"He (Hesiod) calls it ‘great’ because it contains most of the days of the month; therefore all the day is suitable for birth, or he (Hesiod) has called it ‘great’, as if it were completing great undertakings. The one who is generated in this day is very virtuous and learned."
Hesiod and scholia, Erga, 792
(Mosaic in the temple of Apollo at Letoon, Lycia, a recent replacement of the original mosaic- the original can now be seen in the Fethiye Museum..)