Learn Danish: Vi så solen over havet. - We saw the sun over the sea.

In Danish, the word for "the" is attached to the end of the noun. You use -en for common gender words (like sol becoming solen) and -et for neuter words (like hav becoming havet). You simply have to memorize which gender a noun belongs to when you learn it.

Is så an irregular verb?

Yes! så is the past tense of at se (to see). If it were happening right now, you would use the present tense ser (We see), but since it already happened, it changes to så.

I've seen the word så used to mean "so" or "then". How do I know it means "saw" here?

Context is key! så is a very common word with multiple meanings. You can tell it means "saw" in this sentence because it comes right after the subject Vi (We) and acts as the main action verb. If it meant "so" or "then", there would be another verb in the sentence.