The Star of Bethlehem marking the birth of a king
There were a few unusual astronomical events in the period 10 BC to 10 AD that would have interested “Wise Men” of the time.
The most likely contender was the conjunction of Venus and Jupiter in Leo on 17 June 2 BC. Such an event occurs every 2,000 years and accords with both the age of Jesus at his death and the common associations across the various branches of astrology. (It had to be sufficiently unusual for the “Wise Men” to justify their trek. For such a journey, it had to be a phenomena of once in a thousand years or more.)
Several contenders have been put forth as the Star of Bethlehem but a review of the possible contenders to an event that would only occur every few thousand years or so, limits the field. Enforcing a royal (astrological) connotation limits the field to 17th June 2 BC which made Jesus 33 years old at the date of his death and three years into his ministry. This accords with the Bible and the practice of the time.