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In page Sunday:

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In Roman Catholic liturgy, Sunday begins on Saturday evening. The evening Mass on Saturday is liturgically a full Sunday Mass and fulfills the obligation of Sunday Mass attendance, and Vespers (evening prayer) on Saturday night is liturgically "first Vespers" of the Sunday. The same evening anticipation applies to other major solemnities and feasts, and is an echo of the Jewish practice of starting the new day at sunset. Those who work in the medical field, in law enforcement, and soldiers in a war zone are dispensed from the usual obligation to attend church on Sunday. They are encouraged to combine their work with attending religious services if possible.[citation needed]