12 April 2014
Yesterday on Reddit, a consumer named SipTime posted two pictures. One among dawn in Florida, and one other of sundown in Japan. The 2 photographs have been taken inside minutes of one another. Dawn and sundown on the identical time.
Since we reside on a small rocky sphere, this occurs on a regular basis. Whereas the solar rises on one finish of the planet, it units on the opposite. Between these two factors it’s both midday or midnight. Because the Earth turns, we transfer out and in of the shadow of our world. The Solar seems to rise and set because the Earth rotates upon its axis.
After all we all know that each are the identical Solar. Because the Solar is about 150 million kilometers away, the sunshine should journey for greater than 8 minutes to achieve us. All that distance and time, simply to achieve Earth. If it had traveled in a barely totally different path, it will have missed the Earth totally. The Earth is simply 12,700 kilometers extensive, so the sunshine of dawn and sundown left the Solar in virtually the identical path. A distinction in path of solely 0.4% of a level (18 seconds of arc) is sufficient to separated morning daylight from night.
So not solely are these the identical Solar, they’re virtually the identical gentle.
We reside on a small rock racing via house. And our days are marked by the rising and setting of a star.