In both the evening and morning sky, one can see Earth’s shadow. Earth’s shadow is a deep blue-grey, darker than the twilight sky. The pink band above the shadow – in the east after sunset, or west before dawn – is called the Belt of Venus.
The unseen shadow ... Have you ever looked East when the Sun sets? Avert your gaze from the rich, saturated reds and golds to see something spectacular on the opposite side of the sky. At sunset, the Earth's shadow is projected onto our atmosphere. This can be seen as a beautiful rose-tinted, slate blue-grey band of colour in the East. It is called the belt of Venus, and can be breathtaking. If you wait long enough you can begin to see the curvature of our planet as the shadow rises higher.