speed of light in air
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For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200000 km/s (124000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.
One light year: 1.0 year
Metres per second: 299792458
Miles per second: 186000
From Moon to Earth: 1.3 s
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The speed of light in air is about 90 km/s (56min) slower than c.
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