The paths to celestial planets

I'm very intrigued by the following verse that points to a path to celestial planets or brahman. Very mystical and thought provoking. Any insights on these verses would be very much appreciated. Thanks

"Those who know Brahman pass from this world on the path of fire and light, during the time of the waxing moon or during the six months when the sun traverses the northern hemisphere." (BG 8.24)
"Departing on the path of darkness, during the night, during the waning moon or during the six months when the sun makes its course across the southern hemisphere – that yogî attains the celestial lunar planet, but then returns." (BG 8.25)