that year, but this was favoured by Newton. In the twentieth century, the standard view became that of J. K. Fotheringham, who in 1910 suggested 3 April AD 33 on the basis of its coincidence with a lunar eclipse. In 1933, António Cabreira, following a similar method, arrived at the same date, as did, in the 1990s, Bradley E. Schaefer and J. P. Pratt. Also according to Humphreys and Waddington, the lunar Hebrew calendar leaves only two plausible dates within the reign of Pontius Pilate for Jesus' death, and both of these would have been a 14 Nisan as specified in the Gospel of John: Friday 7 April AD 30, and Friday 3 April AD 33. A more refined calculation takes into account that the Hebrew calendar was based not on astronomical calculation but on observation of the lunar phases, following criticism that it is possible to establish the phase of the moon on a particular day two thousand years ago but not whether it was obscured by clouds or haze. Including the possibility of a cloudy sky obscuring the moon, and assuming that the Jewish authorities would be aware that lunar months can only be either 29 or 30 days long (the time from one new moon to the next is 29.53 days), then the refined calculation states that the Friday requirement might also have been met, during Pontius Pilate's term of office, on 11 April AD 27. Another potential date arises if the Jewish authorities happened to add an irregular lunar leap month to compensate for a meteorologically delayed harvest season: this would yield one additional possibility during Pilate's time, which is Newton's favoured date of 23 April AD 34. Colin Humphreys calculates but rejects these AD 27 and AD 34 dates on the basis that the former is much too early to be compatible with , and spring AD 34 is probably too late to be compatible with Paul's timeline, confirming Friday 7 April AD 30, and Friday 3 April AD 33 as the two feasible crucifixion dates. Eclipse method A lunar eclipse is potentially alluded to in Acts of the Apostles 2:14–21 ("The sun shall be turned into darkness, And the moon into blood, Before the day of the Lord come"), as pointed out by physicist Colin Humphreys and astronomer Graeme Waddington. There was in fact a lunar eclipse on 3 April AD 33, a date