Pronunciation of aspiration in ἔδεισεν δ᾽ ὁ γέρων

1. What is aspiration in pronunciation?
2. How do you pronounce Η in Greek?

What is aspiration in pronunciation?

Aspirate: transitive verb: A. To pronounce with the initial release of breath associated with the English “h”, as in “hurry.” “Some dialects do not aspirate the 'h' in 'historical'.”

How do you pronounce Η in Greek?

In the traditional English "Erasmian" system, Ε is pronounced as in "red" ( /ɛ/ ), and Η and ΕΙ both as in "raid" ( /ej/ ).