I meant what is the evidence in favour of your idea that it related to Astarte, rather than Passover?
I know Sol featured on some coins, it's just that there were at least 1,363 different coin designs during his reign, so drawing too much from what appeared on one of them is problematic.
Constantine with Victory
Constantine with a gate
What is problematic, is the “Christians” claim that the vision of Mivian Bridge in 312 A.D. is about a vision of Christ, as propagated by Constantine’s man Friday, and church historian, Eusebius, when in fact, other accounts, are substantiated by the minting of the coin directed at Sol Invictus, with the statement of the vision, “Invictus”/conquer, which is to conquer under the sign of the cross, given by Sol Invictus to Constantine. Constantine didn’t mint coins directed at Christ, he minted coins directed glorifying Sol Invictus. That vision is where you get the standard of Constantine, which has the cross symbol, given to him by Sol Invictus, who is represented on coins minted right after the battle, with portraits of Sol Invictus. The cross is an ancient pagan symbol which can and is used to designate a triad of gods. The Holy Roman Empire did their conquering being crowned by a Roman Pope, who took the position of Maximus Pontifex from Julius Caesar, who took it from the chief pagan priests, and as with the Spanish, followed Constantine’s cross standard, the labarum, held by the Catholic monks, into the Americas, to wipe out the indigenous people, burn their writings, and use them as slaves to dig for gold.
A coin struck in 313, depicting Constantine as the companion of a solar deity
Battle of the Milvian Bridge - Wikipedia
As for Passover, it is to be kept on the 14th of the month of Nissan, based on the cycle of the moon. As for when is Easter currently kept, that is with respect to the Spring pagan festival based on the equinox, a cycle of the sun.
The First Council of Nicaea (A.D. 325) declared that Easter was always to be held on a Sunday, and was not to coincide with a particular phase of the moon, which might occur on any day of the week. https://en.wikipedia.org/wiki/Easter_controversy The first day of the week has a 1 in 7 chances of being the 14th of Nissan. The Spring festival, Easter/Astarte/Ishtar, is based on the position of the sun, not the moon. The Jewish calendar is base on moon cycles. The Roman calendar of Caesar, the 5th head of the beast of Revelation 17:10, was based on the sun, and had 365 days. The dating of Easter is based on the sun cycle, which is contrary to the dating of Passover, which is on a moon cycle.