<Tr> <Td> Septenas idus </Td> <Td> septem eligunt, </Td> <Td> VII </Td> </Tr> <Tr> <Td> senae kalendae </Td> <Td> sortiunt ternos, </Td> <Td> III </Td> </Tr> <Tr> <Td> denis septenis </Td> <Td> donant assim . </Td> <Td> </Td> </Tr> <Tr> <Td> Pridie nonas </Td> <Td> porro quaternis, </Td> <Td> IIII </Td> </Tr>

When is easter and how is it decided