1. Wiosna (21.03):

$k={90}^o-{66}^{o}34{}^{\prime }={23}^{o}26{}^{\prime }$

2. Lato (22.06):

$k={90}^o-{66}^{o}34{}^{\prime }+{23}^{o}26{}^{\prime }={23}^{o}26{}^{\prime }+{23}^{o}26{}^{\prime }={46}^{o}52{}^{\prime }$

3. Jesień (23.09):

$k={90}^o-{66}^{o}34{}^{\prime }={23}^{o}26{}^{\prime }$

4. Zima (22.12):

$k={90}^o-{66}^{o}34{}^{\prime }-{23}^{o}26{}^{\prime }={23}^{o}26{}^{\prime }-{23}^{o}26{}^{\prime }=0^o$

 

Data występowania nocy polarnej: 22.12.