Using the St Matthew’s Gospel as a reference point, Mr Reneke pinpointed the planetary conjunction, which appeared in the constellation of Leo, to the exact date of June 17 in the year 2BC.
The astronomy lecturer, who is also news editor of Sky and Space magazine, said: “We have software that can recreate exactly the night sky as it was at any point in the last several thousand years.
“We used it to go back to the time when Jesus was born, according to the Bible.
“Venus and Jupiter became very close in the the year 2BC and they would have appeared to be one bright beacon of light.
“We are not saying this was definitely the Christmas star – but it is the strongest explanation for it of any I have seen so far.
“There’s no other explanation that so closely matches the facts we have from the time.
“This could well have been what the three wise men interpreted as a sign. They could easily have mistaken it for one bright star.