Thus , lunar declination ranges from a positive value to a negative one in just under two weeks , and back .
The Moon 's declination also changes , completing a cycle once every lunar nodal period : 27.212 days .
Lunar declination ranges from a positive value to a negative one in just under two weeks , and back .
The Moon 's declination also changes , completing a cycle once every lunar nodal period : 27.212 days .