Brihat Samhita
पुरादुदग् यत् पुरतो अपि वा स्थलं ञ्यहोषितस्तत्र हुताशतत्परः । ग्रहान्सनक्षत्रगणान्समालिखेत् सधूपपुष्पैर्बलिभिश्च पूजयेत् ॥ २४-०६ ॥
The astronomer shall choose a suitable station immediately to the north-east of his town, shall spend 3 days in the worship of fire, shall draw out a figure of the constellations with the planets in them and shall worship it with flowers, perfumed smoke and by gifts and sacrifices.
english translation
purAdudag yat purato api vA sthalaM JyahoSitastatra hutAzatatparaH । grahAnsanakSatragaNAnsamAlikhet sadhUpapuSpairbalibhizca pUjayet ॥ 24-06 ॥
hk transliteration by Sanscript