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This is probably about the "horizon coordinate system".

Or, it's sometimes called the horizontal coordinate system.

The system uses "altitude" and "azimuth" as coordinates.

The azimuth is normally measured from due North as zero.

So, that's the "three reference points", probably.

Altitude is the angular height of a star above the horizon.

Azimuth is the angle of a star measured along the horizon, from the pole.

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