Dakshina Kali is the benign form of the goddess where she steps on Lord Shiva with her right foot. When stepping on him with the left, she is know as Vama Kali.
"Your right eye, being the embodiment of the sun creates day, your left eye being the embodiment of the moon creates night, your third eye, radiant like the slightly open golden lotus creates twilight, the midpoint between night and day."
-Saundaryalahari, v. 48