The northward pointing air shafts in pyramids were not actually designed to point directly north. While they were generally aligned with celestial bodies, they pointed towards specific stars or constellations. This is understood to be for symbolic and ritualistic purposes, rather than practical ventilation.

Here's a breakdown:

* Symbolic Purpose:

* Connecting with the Afterlife: The shafts were believed to create a pathway for the pharaoh's soul to ascend to the heavens.

* Alignment with Stars: Some scholars believe the shafts were aligned with specific stars, like Sirius or the Pole Star, representing important deities or astronomical events.

* Ritualistic Purpose:

* Ceremonial Use: The shafts might have been used in specific rituals, like the pharaoh's ascension or the offering of incense.

* Spiritual Significance: The alignment of the shafts might have had a spiritual or symbolic meaning, connecting the pyramid to the cosmos.

While the shafts were not for ventilation:

* There are other small vents and openings in the pyramid for airflow.

* The placement of the shafts high up in the pyramid would have limited airflow.

Some of the most famous examples of aligned air shafts include:

* The Great Pyramid of Giza: Contains four shafts, two pointing towards the north and two towards the south. The northern shafts are believed to be aligned with the stars Thuban and Kochab.

* The Pyramid of Khafre: Contains shafts aligned with the stars Sirius and Orion.

It's important to remember that the exact purpose and meaning of the shafts is still a subject of debate among Egyptologists. However, the evidence suggests that they were primarily symbolic and ritualistic, playing a crucial role in the pharaoh's afterlife journey and their connection to the heavens.