My very vague understanding is that the two celebrations are related because the Last Supper was a Passover Seder. With that in mind how come Easter is occurring nearly a whole month before Passover this year?
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The Hebrew calendar is a lunar calendar meaning it follows the lunar cycles and not the suns cycles like the Gregorian calendar that is most common. This is why Easter and Passover always happens on a full moon. The start of the year is usually at spring equinox so the Church calculates Easter from spring equinox. However the Hebrew calendar is a bit more complex. Because there are 12 months in the calendar and there are sometimes 13 full moons a year they need to add an extra leap month every few years. Spring equinox can land in this leap month pushing back Passover an entire lunar cycle.
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