meaning unveiling. you live inside of the earth. outer space is inner space. the milky way is just a band splitting the seam in the celestial sphere at 60 degrees like a mother's swaddling band.
there are multiple spheres of glass enveloping inner space diverginig light in a spectrum gradually from zenith to lift up from the earth parralel to the terminator to reconverge with the center of heaven like a circuit. this is what lifts up your line of sight, gradually clips boats and bridges, occluding land mass curving upwards. your line of sight is hitting the underside of clouds and converging with the center of heaven within every degree within 180 degrees of your fov. the celestial sphere is therefore figuratively split in two by your line of sight refracting through multiple polarizing bowed spherical glass prisms meaning the half of the celestial sphere visible by your fov compresses/inverts around your 180 degree fov over the optical edit of the horizonal crease.
https://youtu.be/4yR3SU9_fu4