Original Text
And the west quarter is named the diminished, because there all the luminaries of the heaven wane and go down.
Simple English
The western part is called the diminished, because that's where all the lights in the sky fade and set.
And the west quarter is named the diminished, because there all the luminaries of the heaven wane and go down.
The western part is called the diminished, because that's where all the lights in the sky fade and set.