When the sun is less than 18° below the horizon at midnight, also known as astronomical twilight, evening twilight turns into morning twilight and the night is said to belong to the light nights.
When is the sun closest to the earth?
The sun is slightly closer to the Earth in winter because the Earth’s orbit around the sun is elliptical.
How much of the sun’s radiation hits the earth?
Of the total radiation from the sun, only half a billionth reaches the earth.
How hot is the sun?
The temperature on the surface of the sun is a modest 5800 degrees, while the interior of the sun is 15 million degrees.
Letters and stars
If you built a bookshelf from the ground to the sun, 1000 stories high, and filled it with books, the number of letters would equal the number of stars we know today.
