Your response is the better of all the lengthy ones above it. Actually made me smile.

BC and AD are how Christians – and pretty much ALL Western people – have named the two eras for centuries. Insisting on the now stylish usage is no different from demanding one’s pronouns!

According to modern astronomy, Jesus was born June 17th 2B.C. during the conjunction of Jupiter and Venus. The Magi left Babylon on Oct and followed the wandering star Jupiter as it retrograded 3 times. The final time it appeared to stop was over Bethlehem. This occurred, according to astronomical software on Dec 25h 2 B.C. If we back up the software six months from His birth we have Sept 17th 3B.C. This was the conception date of Mary and in the sky the vision John saw actually appeared over Israel/Judah. Jesus was crucified April 3rd, 33 A.D. He was 33 years old but would have turned 34 in June. He was placed in His tomb Friday April 3rd and astronomy shows that a full Blood Moon rose over Israel at sunset.

Mary’s conception date was cited by John in Revelation concerning a vision he had. He saw a “great wonder in the sky”. We know by way of modern astronomy that Jesus was born June 17h 2B.C. during the conjunction of Jupiter (King planet) and Venus (planet of love). So all we need to do is back up the software 9 months. We clearly see that the ‘wonder’ John saw in the sky actually occurred over Israel on Sept 17th of 3 B.C. This would mean it occurred during the season of Rosh Hashanah. Most probably during the feast of Yom Kippur when the Jews pray for salvation from sin. Yom Kippur is also the only feast that involves the sacrifice of an animal for sin. It is also the only time that the High Priest takes the blood of this sacrifice into the Holy of Holies and sprinkles it on the Ark of the Covenant. This is seen as a propitiation for the sins of the people. Mystery solved using science in conjunction with Scripture. There, that was easy!

Modern astronomy has solved this topic once and for all. We clearly see the conjunction of Venus (planet of love) and Jupiter (King planet) on June 17th 2B.C. This was when Jesus was born. The Magi saw this, made plans and left in Oct for their 900 mi journey due West to Jerusalem They knew to look for a sign over Judah from the writings of Daniel their Chief Magi. The trip at 15 miles per day took 3 months. They were now following Jupiter which made 3 incredible retrogrades. It appeared to stop and then move in the opposite direction. The first retrograde was late Oct, the 2nd late Nov and the third on Dec 25th 2B.C. when the Magi arrived with their gifts! Scripture actually states that the Star “stopped over Bethlehem”. This is why we celebrate Christmas on this date as it was the first celebration of the birth of Christ. Up until 1544 ‘all’ manuscripts state that Herod died in 1 B.C. All manuscripts after 1544 state he died in 4B.C. Why this change of date is unexplained. However, Josephus stated Herod died during an eclipse of the moon. Astronomy shows us, with no chance of error, that here was an eclipse of the moon Dec 28th 1 B.C. So the pre 1544 date is correct and, this date for his agonizing death was fitting as it occurred on the one year anniversary of the killing of the children of Bethlehem one year earlier on apparently Dec 28th 2B.C. Case closed!

You’re wrong.
Julius Caesar died before the first Leap Day was supposed to be intercalated, the priests in Rome mistakenly adding it to the end of February after the 3rd year rather than the 4th year, and this mistake continued through a total of 36 years, during which 12 leap days — rather than just 9 — had been added. This was 3 too many, and so Augustus called for this mistake to be rectified by ceasing to add Leap Day for a number of years. He ought to have waited until 3 cycles of 4-year chunks of Time had transpired before re-activating the every-4th-year leap cycle again, however he jumped the gun by making the year AUC 757 the first one with a Leap Day after that hiatus of more than a decade. Caesar’s calendar — if it had been implemented properly — would have had the years AUC 712, 716, 720, 724, etc. all be 366-day Leap Years, all such years having numbers evenly divisible by 4, you’ll notice.
But the priests mistakenly made the years AUC 711, 714, 717, 720, 723, etc. into 366-day leap years, with AUC 744 being the last leap year when Augustus put a stop to it. He should have resumed it so that AUC 760 would be the first leap year after the hiatus, since ‘760’ is evenly divisible by ‘4’, as Caesar had intended.
But Augustus, instead, made AUC 757 the 1st leap year of what could be thought of as the 1st cycle of the ‘Augustan’ era, the 4th year counting from AUC 754.
It wasn’t until centuries later that ‘Little Dennis’ retro-calculated December 25 of the year AUC 753 as the day on which Jesus was born, the newly-styled ‘Christian’ era then starting with the year the Romans called AUC 754. It was renamed ‘AD 1’, of course, but the Leap Year cycle — resumed after a delay of 13 years — was the defining element insofar as calculating Leap Day was concerned. After the fact, of course, it became apparent that under the Christian re-numbering of the years, each Leap Year once again followed the rule that Leap Year numbers were evenly divisible by 4, as Caesar had originally intended.
The Roman priests botched it, with Caesar’s assassination preventing him from overseeing the proper implementation of his Leap Year rule. Augustus ‘fixed’ the problem — but only imperfectly, as his next ‘first’ leap year ought to have been in AUC 760, rather than AUC 757.
But all this calendrical confusion predated the Christian re-numbering of years by about 500 years. Your Christianity-centric views are due to an ignorance of how the Julian Calendar progressed from its creation in AUC 708-to-709 through the years of confusion culminating in the new ‘Augustan’ 4-year-cycle of AUC 754-to-757 . . . which was re-numbered 500 or so years later to be deemed AD 1-to-4.

Actually, they may have intended so the designations could be read as desired: Christians and non-Christians alike but kept it quiet.

David Hocking said 2 BC also.

Hmmm? Passover always occurs at full moon, not new moon. Nisan 14 is the meal then a week of celebration from the 15th of Nisan. Solar eclipses only occur at the start of a month.