The Borana Calendar plays a large role in the analysis of Namoratunga II,

The Borana calendar is based on the rising of the new Moon with various asterisms. The question for Namoratunga II is where these key stars were in 300 BC.

• Sky of Kenya in 300 BC

Brian Warner (in Astronomy Before the Telescope, British Museum Press, 1996, page 315) gives a photo of a bone tally stick (a baboon fibula) with 29 notches giving 28 spaces that could represent the days of the lunar cycle.

• Photophraph of Bone Tally Stick