Η ανεύρεση δηλώνεται σήμερα.

Η is the definite article in the feminine singular nominative form. It matches ανεύρεση, which is a feminine singular noun.

So:

• η = the for a feminine singular subject noun
• ανεύρεση = feminine singular noun

Greek uses the definite article more often than English, so even where English might sound less natural with the, Greek may still use it.

Here ανεύρεση is in the nominative singular, because it is the subject of the sentence.

You can tell mainly from the article:

• η ανεύρεση = nominative
• την ανεύρεση = accusative

Since the sentence is built with a passive-style verb, the thing being talked about becomes the grammatical subject, so nominative makes sense.

Ανεύρεση is a feminine noun. Nouns ending in -ση are very often feminine in Greek.

This ending is common in nouns that describe:

• an action
• a process
• a result of an action

So a learner will often see similar nouns like:

• η λύση
• η χρήση
• η αναζήτηση

Because δηλώνεται is the mediopassive/passive present form, while δηλώνει is the active present.

Compare:

• δηλώνει = he/she/it declares
• δηλώνεται = it is declared / it is being declared

So the sentence is using a passive-style structure. The subject is η ανεύρεση, and the verb agrees with it in third person singular.

In Modern Greek, the forms traditionally called middle and passive are the same in many tenses, so grammars often call them mediopassive forms.

In this sentence, the most natural interpretation is passive-like:

• η ανεύρεση δηλώνεται = the finding/discovery is declared/reported

So technically the form is mediopassive, but in meaning it works like an English passive here.

Because Greek does not need a separate auxiliary here the way English does.

In English:

• is declared

In Greek, the single verb form δηλώνεται already includes:

• the idea of the verb
• present tense
• third person singular
• passive/mediopassive meaning

So δηλώνεται by itself already means something like is declared or is being declared.

The Greek present here can cover meanings like:

• is declared
• is being declared
• sometimes a formal or procedural present

So δηλώνεται σήμερα can sound like a current, official, or scheduled action happening today.

If you wanted to say that the action was completed earlier today, Greek would often use an aorist form instead, such as δηλώθηκε σήμερα.

Because Greek word order is fairly flexible, especially with adverbs like σήμερα.

This sentence puts σήμερα at the end in a natural way:

• Η ανεύρεση δηλώνεται σήμερα.

But other orders are also possible, for example:

• Σήμερα δηλώνεται η ανεύρεση.

The difference is mostly about focus or emphasis, not basic grammar.

Yes. Greek allows more movement than English, as long as the sentence remains clear.

Possible versions include:

• Η ανεύρεση δηλώνεται σήμερα.
• Σήμερα δηλώνεται η ανεύρεση.

All of these keep the same basic meaning, though the emphasis may shift slightly. Greek often uses word order to highlight what is new, important, or contrastive information.

A simple pronunciation guide is:

i aneVresi dhiLOnete SImera

More roughly:

• Η = ee
• ανεύρεση = a-NEV-re-si
• δηλώνεται = dhee-LO-ne-te
• σήμερα = SI-me-ra

The stressed syllables are:

• ανεύρεση
• δηλώνεται
• σήμερα

Not by itself. The sentence leaves the agent unstated.

That is normal in passive-style Greek. If you want to add who does it, you can use από:

• Η ανεύρεση δηλώνεται σήμερα από την αστυνομία.

So the original sentence focuses on the event itself, not on the person or institution performing the action.