Link between depresion and lack of sunshine/ vitamin D?

does anyone know about and links between depression and a lack of sun or vitamin D? ive been doing things recently associated with depression.Link between depresion and lack of sunshine/ vitamin D?
SAD or seasonal affective disorder.
Read about it here:
http://www.mayoclinic.com/health/seasona...
See if it fits your symptoms.
This explains Vitamin D link:
http://www.cfs-recovery.org/seaonal_affe...
it,s call sad seasonal a. disorder ask your doctor for Zoloft.or eat lots of vitamin d pills.
http://www.webmd.com/depression/news/200...