My guess is that during Britannica's pre-Reformation
that is our center, the source of light and life here on earth.
Since a solar rainbow is the full expression of visible, physical light
And remember, there was darkness at noon on Good Friday...
that rent the curtain of Jerusalem's Temple
(the former home of the lost Ark of the Covenant)
It all comes together
at the cross of Jesus Christ...
JESUS CHRIST IS LORD!
Become like Jesus
Live for the Triune God
Seek the Light of Our Lord Jesus Christ!