![Pulsar frequencies](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/f/f7/Pulsar_frequencies.jpg/revision/latest/scale-to-width-down/180?cb=20160121145559&path-prefix=en)
A computer displaying three pulsars
Pulsar triangulation was a manner of navigation whereby pulsar frequencies and their geometric light year measurements were used to identify a specific location in space.
In 2153, while Phlox was briefly connected to the Borg collective consciousness, he was able to detect a specific set of numbers being repeatedly transmitted to the Delta Quadrant. Feeding the numbers into Enterprise NX-01's computer, the numbers were revealed to be the spatial coordinates of Earth, suggesting a future invasion – though not for another two hundred years. (ENT: "Regeneration")