Two things.
If you studied Mithraism as closely as you claim, you will realise that Constantine didn't convert because of a comet. In fact he didn't convert at
all until he lay on his death bed, and even then, he probably didn't have much choice. Constantine didn't have a lot of time for Christianity,
contrary to what we are led to believe. He chaired the Council of Nicea (the first real founding of Orthodoxy) but half the time couldn't even be
bothered to turn up.
In all probability, the story of the cross in the sky was created by the Church. It certainly added to the story and stated that later that night,
Constantine was visited by Jesus in a dream. It should also be noted that the cross which adorned the shields of Constantine's army was not
the Christian cross.
Secondly, the Crusades weren't undertaken because of astrology. Astrology may have played a part in it once it was underway though as it was pretty
much viewed as a science back then. It's likely that once the decision to Crusade was made, astrological factors were taken into account but they
were used as an aid and not a means. There are plenty of accounts of crusading armies waiting on astrology before attacking their enemies in the Holy
Land.
The Crusades were also never undertaken to rebuild King Solomon's Temple. There is absolutely no evidence for this and indeed, it proves the
contrary. There is a theory that the Knights Templar stabled their horses on the site and excavated underneath but there was never the slightest
attempt to repair or recreate the building. When you remember the amount of fortresses and castles that were built in the Holy Land during the time of
the Crusades you can see that the Temple was not a priority at all.
The timing for the Crusades was based on a much more mundane factor. Competing kings, barons and knights came into power and looked to the Church for
consolidation. The best way to gain this was by crusading in the name of Christianity.



