Orthodox Christians’ worship has its roots in Jewish worship.
For starters:
° our holy days begin at sundown with the lighting of lamps.
° the Psalms are at the heart of all of the daily prayer hours.
° great reverence and dignity is given to the book of the Gospels
° the church architecture borrows from the Jerusalem temple with certain areas restricted to the clergy.
° the Feast of feasts, Pascha (Easter) is closely linked to the Passover, as the title “Pascha” implies.
A special side is present in other Christian traditions that take pains to echo Jewish tradition. I think of the Seventh Day Adventist sabbath tradition, for example. They can and do sometimes share church facilities with Sunday (Lord’s Day) worshiping traditions, getting twice the use out of the same facilities and honoring one another’s traditions. I saw one such arrangement in Gainesville, Florida with Orthodox Presbyterians.