<Tr> <Td> Temperature </Td> <Td> 6900 K </Td> </Tr> <Tr> <Td> Rotational velocity (v sin i) </Td> <Td> 110 km / s </Td> </Tr> <Tr> <Td> Age </Td> <Td> 7 × 10 years </Td> </Tr> <Tr> <Th_colspan="2"> Position (relative to α UMi Aa) </Th> </Tr>

The north star polaris is not always due north because of which characteristic of earth's axis