Which hormone has no direct role in the menstrual cycle?

Females produce different kinds of hormones during the menstrual cycle. Among these hormones are progesterone, estrogen, Follicle Stimulating Hormone (FSH), and Luteinizing Hormone. 

The hormone that has no direct role in the menstrual cycle is TESTOSTERONE. Females produce this hormones in very low levels.

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun