Season,Solstice and Equinox

1. Season,Solstice and Equinox By Yuta Lesmana & Hansen Austin

2. Definition of Seasons • A season is a subdivision of the year, marked by changes in weather, ecology, and hours of daylight. Seasons result from the yearly revolution of the Earth around the Sun and the tilt of the Earth's axis relative to the plane of revolution. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to go into hibernation or to migrate, and plants to be dormant.

3. Cause of season • The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun). The tilt toward the sun is maximized during Northern Hemisphere summer in late June (the "summer solstice"). At this time, the amount of sunlight reaching the Northern Hemisphere is at a maximum. It’s also cause by the rotation and revolution of the earth.

4. Summer • Summer is the warmest of the four temperate seasons, between spring and autumn. At the summer solstice, the days are longest and the nights are shortest, with day-length decreasing as the season progresses after the solstice. The date of the beginning of summer varies according to climate, culture, and tradition, but when it is summer in the Northern Hemisphere it is winter in the Southern Hemisphere, and vice versa.

5. Winter • Winter is the coldest season of the year in temperate climates, between autumn and spring. At the winter solstice, the days are shortest and the nights are longest, with days lengthening as the season progresses after the solstice.

6. Autumn • Autumn or fall is one of the four temperate seasons. Autumn marks the transition from summer into winter, in September (Northern Hemisphere) or March (Southern Hemisphere) when the arrival of night becomes noticeably earlier.

7. Spring • Spring is one of the four temperate seasons, the transition time between winter and summer. Spring and "springtime" refer to the season, and also to ideas of rebirth, renewal and regrowth. The specific definition of the exact timing of "spring" varies according to local climate, cultures and customs. At the spring equinox, days are close to 12 hours long with day length increasing as the season progresses.

8. Time of season • In the southern hemisphere: Summer=December, January, February Autumn=March, April, May Winter=June, July, August Spring= September, October,NovemberIn the northern hemisphere: June 21 - September 21 is Summer September 21 - December 21 Autumn December 21 - March 21 Winter March 21 - June 21 Spring

9. What is solstice and equinox? • Solstice is an astronomical event that happens twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere. • Equinox is occurs twice a year (around 20 March and 22 September), when the tilt of the Earth's axis is inclined neither away from nor towards the Sun, the center of the Sun being in the same plane as the Earth's equator.

10. Solstice in 2012

11. Equinox in 2012

12. Cause of Solstice • The Earth is spinning like a top - a tilted top. The Earth's axis of rotation is tilted about 23.5 degrees from the plane of the ecliptic, or the plane of the Earth's orbit. (All the planets have different orbital planes. Most of them are fairly close, but none of the other planets are exactly on. ) 

13. The Causes of Equinox • The equinoxes are caused by the declination angle of the sun being zero . The declination angle changes as the earth orbits around the sun.

14. The ComicAbout Season

17. CONCLUSION • So solstice and equinox can be a ritual that happen twice each year it is caused by the earth rotation, season and the sun.

18. Thank you for Watching By: Hansen & Yuta ^6d^