On what day of the week was Christ crucified?
The answer greatly affects how one understands the events of Christ’s whole Last Week (which events form a significant share of the Gospels).
The options are Wednesday, Thursday or Friday. Wednesday is a bit fringe, but surprisingly popular. The Thursday view has risen greatly in popularity in the last several decades amongst evangelical scholars.
This webpage provides in-depth resources defending the majority view of Church History, that Christ ate the Passover on Thursday, the 14th of Nisan, and was crucified on Friday the 15th of Nisan.