Historical imagery of the Human, Vulcan, and Orion civilizations was displayed by the Guardian of Forever. (TOS: "The City on the Edge of Forever" ; TAS: "Yesteryear") In 2268, the starship USS Enterprise traveled back in time to 1968 for historical research. (TOS: "Assignment: Earth" ) 28th century scientists observed the construction of the Great Pyramid at Giza. (ENT: "Cold Front") In the 31st century, Daniels owned a hand-held Temporal Observatory. (ENT: "Cold Front")
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