'"Thy star in trine" is an astrological term, which signifieth when your natal planet shall be in a certain quarter of the heavens.

The verse is of the nature of a prophecy.

The Chaldeans and Egyptians of old are said to have attained much skill in the art, but I confess that I have no great opinion of those latter-day prophets who busy themselves in answering the foolish questions of every housewife.' 'And tell by Venus and the moon, Who stole a thimble or a spoon.' muttered Saxon, quoting from his favourite poem.
'Why, here are our Colonels catching the rhyming complaint,' said the King, laughing.

'We shall be dropping the sword and taking to the harp anon, as Alfred did in these very parts.

Or I shall become a king of bards and trouveurs, like good King Rene of Provence.