Assalamu'alaikum warahmatullahi wabarakatuh. Btw I am a new member in this forum. I want to ask about Islamic calendar. There are some people or maybe many people who already said that Islamic Calendar has been wrong until now. They said the Islamic Calendar supposed to be Lunisolar Calendar not Lunar Calendar that we have been using until now. These are the explanation of those people

https//youtu.be/fvuVsqqP_lw

https//youtu.be/bXvBSB7o_-Q

https//youtu.be/gPjv5w4eVBg

https//youtu.be/ao5yghHxi54

https//youtu.be/WG64f4Q7fvQ

What do you think about these explanations?

And the second question I wanna ask, I read that it's not obligatory that mosque should has crescent moon symbol on the minaret but why many mosques have crescent moon symbol on its minaret? I read that someone say it's probably pagan symbol inserted by people. I read that the crescent moon is the symbol of hubal, the pagan god of Quraysh before Islam, and I googled it, and it is very similar.

The interesting part is I search the oldest mosque Al-Haram Mosque, Haram Al-Sharif, and Quba Mosque, all of them have crescent moon on its minaret. And the oldest mosque outside Saudi Arabia also has crescent symbol on its minaret like mosque of the companions (Eritrea) and Al Nejashi mosque (Ethiopia).

What do you think about it?