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Cycles of global glaciation
Age: 95–104 million years (Cretaceous)
And Gamma Draconis
a Cretaceous formation in central-western Queensland
Handheld sky-quality meter The natural world Cycles of global glaciationAn affordable meter for measuring sky brightness for astronomers! The sky quality meter measures the brightness of the night sky in magnitudes per square arcsecond. Unprecedented sensitivity in a handheld meter! Uses Find out how good the night or site REALLY is. Compare the sky brightness at different sites quantitatively. Document the evolution of light pollution in your area. Set planetarium dome illumination to mimic the skies people are likely to
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