Presentation on theme: "How does our journey through space cause days, years, and seasons?"— Presentation transcript:
1How does our journey through space cause days, years, and seasons? As the World TurnsHow does our journey through space cause days, years, and seasons?
2RotationEarth rotates on its axis once every 24 hours. We call this one day.When your part of the earth faces the sun, you experience day. What happens to cause night?
3East WestSun appears to rise in the east and set in the west because the Earth turns on its axis from west to east.
4RevolutionThe path the Earth takes around the sun is called it’s revolution. It takes us days to travel around the sun. We revolve around the sun counterclockwise.
5Moving through SpaceThe Earth revolves around the Sun at a rate of about 67,000 miles per hourWe are also moving through space with our solar system and the Milky Way GalaxyWe don’t feel how fast we are moving because we have no way to sense the movement
6SeasonsAre caused by the tilt of the Earth’s axis, which is at an angle of 23.5 degreesEach season lasts 3 monthsEquator is the line that divides the Northern and Southern HemispheresThe hemisphere tilted toward the sun gets more direct lightThere are four special times during the year.
7+SolsticesSummer Solstice – sun’s rays hit as far north as the tilt will allow – occurs in the month of JuneWinter Solstice – sun’s rays hit as far south as the tilt will allow – occurs in the month of December
8Observing SolsticesThe Summer and Winter Solstices have been important to mankind for a long time. Stonehenge is aligned to measure the solstices.
9EquinoxesVernal Equinox in March and the Autumnal Equinox in September; Equinox means “equal night”. These were considered the two days of the year where daylight and nigh time hours were equal. Now refers to the days the center of the sun is directly above the equator.