The Magi came to Bethlehem because they saw a sign in the sky. It was a comet which broke into pieces, forming a pattern by the arrangement of the comet pieces and their relation to the stars and planets. They interpreted this, by the grace of God, as the birth of a great king, a king so greatly favored by God that his birth would be written into the stars and the sky.
Blessed A.C. Emmerich describes the Magi seeing the comet break apart: “They were on a pyramid-shaped tower looking through long tubes at the Star of Jacob, which had a tail. The star split asunder before their eyes, and I saw a great shining virgin appear therein, before whom a radiant child hovered in the air.”
(Ancient astronomers in China used to view the sky through long tubes, so that they could see the stars even during the day. It is possible that people in other lands also used this technique.)
The Roman also observed this comet. Cassius Dio describes this comet, saying it “dissolved into flashes resembling torches.”
However, this does not explain how the Magi found the Christ-Child. I believe that, as the Magi approached the holy land, a supernatural (or preternatural) light appeared to guide them specifically to Bethlehem, to the place of the birth of the Savior.
RLCJ
the reproach of Christ 
Looking at the sky through long tubes may or may not help see the stars at night, but it does not work during the day.
Try it with a paper towel tube.
Yes, they used it during the day. Very long tubes are necessary to block out sunlight and only receive the light from a few stars.
What Ezekiel saw in Ezekiel 1.
God’s created reality is rather simple and self explanatory, for the poor of heart.
On contrary, those scholars (religious and secular) who are never satisfied and yet never let to be taught, those fanatics who pretend to hold the finger of God, those self indulged righteous ones who do not love their brother to see and love God through him (ref. 1 John 20), they would deny everything they do not accept even if they see it themselves. They would not accept Jesus if they would have been in the place of the magi or the shepherds, and certainly they would not accept the Bethlehem star if would appear tomorrow again to lead us to God. Therefore Jesus said, “Truly I tell you, unless you change and become like little children, you will never enter the kingdom of heaven”.
And let me tell you something, I cared for “their theology” much in the past, fulfilling the letter and requiring others to fulfill it too. But no more. Not for human sake, and certainly it is not for God’s sake. God does not want sacrifice but Mercy. God does not want someone to sacrifice other people, because it is nothing short of satanic. If someone wants to sacrifice himself then he is free to do so.
One cannot “hold the finger of God” and pretends all that God has to say is within his own limited human grasp. God is God exactly because His ways are farther than ours. And if He is presenting Himself as a baby it is His free choice, and not the fanatics own grasp of the truth.
Their grasp cannot be farther from the Bethlehem manger. They will never know God’s ways because first of all they are not humble like children, and second of all, they do not love.
1 Corinthians 1:25
For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.