<Tr> <Th> Name </Th> <Th> Value (days) </Th> <Th> Definition </Th> </Tr> <Tr> <Td> Sidereal month </Td> <Td> 7001273216620000000 ♠ 27.321 662 </Td> <Td> with respect to the distant stars (13.36874634 passes per solar orbit) </Td> </Tr> <Tr> <Td> Synodic month </Td> <Td> 7001295305890000000 ♠ 29.530 589 </Td> <Td> with respect to the Sun (phases of the Moon, 12.36874634 passes per solar orbit) </Td> </Tr> <Tr> <Td> Tropical month </Td> <Td> 7001273215820000000 ♠ 27.321 582 </Td> <Td> with respect to the vernal point (precesses in ~ 26,000 years) </Td> </Tr>

1. earth is located at one of the moon's orbit