#kettner #eclipses #ThrowbackThursday

Who was Nicolai copernicus?

Nicolai Copernicus was a man who changed our understanding of astronomy when he proposed that the sun, not Earth, was the center of the solar system.

Why do we have seasons?

We have seasons because the earth is tilted as it makes its yearly journey around the sun. This means that the Earth is always "pointing" to one side as it goes around the Sun.

Why isn't it warmer in the winter since the sun is closer?

During the winter, the sun's rays hit the Earth at a shallow angle. These rays are more spread out, which minimizes the amount of energy that hits any given spot.

Why aren't there lunar eclipses every month?

Moon phases are the result of the Moon's own shadow. When the shadow of Earth moves across the Moon, we call it a lunar eclipse. When the Moon moves between Earth and the Sun, it casts a small shadow on Earth, and people inside that shadow see a solar eclipse.

Why do we have day and night?

The Earth takes 24 hours to make one complete turn. We have day and night because the Earth rotates. It spins on its axis, which is an imaginary line passing through the North and South Poles. The Earth spins slowly all the time, but wedon't feel any movement because it turns smoothly and at the same speed.

Whats an equinox?

The time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) andSeptember 22 (autumnal equinox)

What is a solstice?

Either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or aboutDecember 22, when it reaches its southernmost point.