The northern rays of the sun are the honey-cells on the left. The (hymns of the) Atharvângiras are the bees, the Itihâsa-purâna (the reading of the old stories) is the flower, the water is the nectar.

In plain words: The sun's northern rays are like honeycomb cells on the left. The hymns of the Atharva Veda are the bees. The old stories and legends (Itihasa-purana) are the flower, and the water is the nectar.