From Wikipedia
Good Friday (from the senses pious, holy of the word "good" is a religious holiday observed primarily by Christians commemorating the crucifixion of Jesus Christ and his death at Calvary. The holiday is observed during Holy Week as part of the Paschal Triduum on the Friday preceding Easter Sunday, and may coincide with the Jewish observance of Passover. It is also known as Holy Friday, Great Friday, Black Friday, or Easter Friday, though the latter properly refers to the Friday in Easter week.
Based on the details of the Canonical gospels, the Crucifixion of Jesus was most likely to have been on a Friday (John 19:42).[4] The estimated year of the Crucifixion is AD 33, by two different groups, and originally as AD 34 by Isaac Newton via the differences between the Biblical and Julian calendars and the crescent of the moon.[5] A third method, using a completely different astronomical approach based on a lunar Crucifixion darkness and eclipse model (consistent with Apostle Peter's reference to a "moon of blood" in Acts 2:20), points to Friday, 3 April AD 33.

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