At Passover, there is a full moon. Hence, no eclipse.
"For the Jews celebrate their Passover on the 14th day according to the moon, and the death of our Saviour falls on the day before the Passover. But an eclipse of the sun can only take place when the moon comes under the sun, how then could an eclipse have occurred when the moon is directly opposite the sun?"
It was an act of GOD, clearly. (Then again, so are solar eclipses, though this was a special case.)