FWIW the Jewish High priesthood specialized in Astronomey and astrology, as did the Essenes.
Imagine how bright the night sky was back then with NO air pollution, and very few after-sunset lights.
People had a lot of time to kick back and look and chart and speculate about the stars, which were thought to be tiny windows into the divine heaven.
BTW, Halley’s Comet is said to lose 10% of its brilliance each pass around the sun. Think of how bright it was 25 passes ago.
We’re not talking about how bright Halley’s Comet (or any other heavenly body) was here, Steve. Correct me if I’m wrong, but you seem to work under the assumption that the star had to be visible/bright and that it was seen by people other than the Magi. But I must point out again that a plain reading of the text does not show that. Let’s review:
Now when Jesus was born in Bethlehem of Judea in the days of Herod the king, behold, wise men from the East came to Jerusalem, saying, “Where is he who has been born king of the Jews? For we have seen his star in the East [or: *at its rising], and have come to worship him.”
When Herod the king heard this, he was troubled, and all Jerusalem with him; and assembling all the chief priests and scribes of the people, he inquired of them where the Christ was to be born. They told him, "In Bethlehem of Judea; for so it is written by the prophet:
`And you, O Bethlehem, in the land of Judah,
are by no means least among the rulers of Judah;
for from you shall come a ruler
who will govern my people Israel.’"
Then Herod summoned the wise men secretly and ascertained from them what time the star appeared; and he sent them to Bethlehem, saying, “Go and search diligently for the child, and when you have found him bring me word, that I too may come and worship him.”
When they had heard the king they went their way; and lo, the star which they had seen in the East went before them, till it came to rest over the place where the child was. When they saw the star, they rejoiced exceedingly with great joy; and going into the house they saw the child with Mary his mother, and they fell down and worshiped him.
This is actually what dooms modern searches for the Star of Bethlehem in my opinion, really: most people assume that it must have been a bright/prominent phenomenon when nowhere in the text is it really said or even necessarily indicated to be a bright or a prominent phenomenon in the sky. This assumption really unnecessarily limits the available possibilities more than one should. (And of course, this is assuming a naturalistic, explainable-by-science explanation for the star.)
I’ll go with analogies again. It’s kind of like trying to find a red ball in a junkyard. Now the only thing we know about the ball is that it is a ball, and that it is red. However, for some reason, others who look for the same ball tend to go beyond the description. One assumes that the ball must have been as large as a basketball, the other assumes that it must be spotted, the third guy thinks that it’s of a particular shade of red, say scarlet. But what if the ball turns out to be just a plain, ping-pong sized wine-red ball?