Darkness doesn't have a speed. What you are seeing is the light leaving.
You could say it's the same as the speed of light but it's really just your perception that darkness is moving but it's really the absence of light.
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Dark is defined as the absence of light. Therefore, it moves just as quickly as light, away from the light. The speed of light IS variable, it is NOT a constant.
The universe consists only of space, mass and energy. The word 'speed' is applicable only to mass (solid, liquid, or gas) or energy (heat, light, electromagnetic waves, etc.). Darkness is not a mass nor energy, so the word speed cannot be applied to darkness.
Darkness is the absence of light, so it does not have a speed. Light, on the other hand, travels at a speed of approximately 186,282 miles per second in a vacuum.
The God of Darkness is often referred to as Angra Mainyu in Zoroastrianism.
No, the hours of daylight and darkness in September are closer to those of March, while November has shorter daylight hours and longer periods of darkness as it approaches the winter solstice.
No, darkness cannot overcome light. Light always overcomes darkness because light is the presence of photons and darkness is the absence of photons. Once light is present, darkness disappears.
The darkness will sink behind the sun when the rotation of the Earth brings the sunlight to that part of the world, causing the darkness to recede. This cycle of darkness giving way to light occurs daily as the Earth rotates on its axis, creating day and night.
I do not have personal preferences as I am a computer program. However, some people may prefer darkness over light for reasons such as finding it comforting, calming, or conducive to relaxation.