Throughout September, the TESS-W light monitor recorded the changing brightness above the Valley, minute by minute.
And on 16 September, it recorded a remarkable reading of:
🌌 22.74 mag/arcsec²
The higher the number, the darker the sky!
Ingram Valley Safaris
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www.ingramvalley.co.uk The Ingram Valley Farm Safari Award Winning National Park Experience Northumberland National Park Love the great outdoors, astronomy, wildlife, farmlife, archaeology and geology.
