Then the carpenter should place the trunk (of the tree) and mount it on a platform, so that it is kept horizontally with its tip resting on something. On the 11 th lunar day of the same month the king should cause vigil to be observed at night. The royal priest dressed in white clothes and wearing a white turban should offer oblations to the sacred Fire with hymns addressed to Indra and Viṣṇu, while the astrologer should observe the auguries of the sacred fire.