What is used to establish absolute location?
calendar dates
compass points
cycles of the moon
longitude and latitude

Longitudes and latitudes are used to establish absolute location.

Explanation:

Latitudes are parallel lines that run throughout the Earth, whereas the 0 degree is called the Equator and other two important parallel lines are Tropic of Cancer and Tropic of Capricorn.

Longitudes are perpendicular lines that runs from North - South direction which is narrower near the poles and is broader near the Equator.

Hence, any location can be located precisely with absolute certainty, if Latitude and Longitude of that location is known.

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