Easter Sunday takes place this Sunday, on 17 April, with the Friday (16 April)

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that has just passed being Good Friday and the Monday coming known as Easter Monday (18 April).

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Unlike other major holidays that take place throughout the year, such as Christmas or Halloween,

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the date of Easter Sunday can vary year by year - and is actually dictated by the moon.

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Easter Sunday is determined by the Sunday after the first full moon which follows the spring equinox.

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The spring equinox always happens on 21 March

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and the first full moon after that date this year is Saturday 16 April

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which is why Sunday 17 April is Easter Sunday.

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These rules mean that Easter Sunday can happen as early as 22 March

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however the last time that that happened was in 1818.

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