Friday, January 17, 2020

(Class 9 Unit 5) Enlightening Souls എന്ന ഈ Unit - മായി ബന്ധപ്പെട്ട കൂടുതല്‍ വിവരങ്ങള്‍

Major Seasons 
A season is a division of the year marked by changes in weather, ecology, and the amount of daylight. On the Earth, seasons are the result of the Earth’s orbit around the Sun and it’s axial tilt relative to the ecliptic plane. Subtropical and tropical areas have climates better described in terms of other seasons, e.g. dry or wet, monsoonal or cyclonic. Cultures may have local names for seasons which have little equivalence to the terms originating in Europe.
Spring (വസന്തം)
Spring, also known as springtime, is one of the four temperate seasons, following winter and preceding summer. When it is spring in the Northern Hemisphere, it is autumn in the Southern Hemisphere and vice versa. At the spring (or vernal) days and nights are approximately twelve hours long, with day length increasing and night length decreasing as the season progresses. Spring and “springtime” refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection and regrowth. 
Summer (വേനല്‍ക്കാലം)
Summer is the hottest of the four temperate seasons, falling after spring and before autumn. At the summer solstice (time when the sun is farthest north or south of equator), the days are the longest and the nights are the shortest, with day length decreasing as the season progresses. The date of the beginning of summer varies according to climate, tradition, and culture. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere and vice versa.
Autumn (ശരത്കാലം)
Autumn, also known as fall in North American English, is one of the four temperate seasons. Autumn marks the transition from summer to winter, in September (Northern Hemisphere) or March (Southern Hemisphere), when the duration of daylight becomes noticeably shorter and the temperature cools considerably. One of its main features in temperate climates is the shedding of leaves from trees.
Winter (ഹേമന്തം)
Winter is the coldest season of the year in polar and temperate zones (Winter does not occur in most of the tropical zone). It occurs after autumn and before spring in each year. Winter is caused by the axis of the Earth in that hemisphere being oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definition based on weather. When it is winter in the Northern Hemisphere, it is summer in the Southern Hemisphere and vice versa. In many regions, winter is associated with snow and freezing temperatures. Day length increase and night length decrease as the season progresses after the solstice. 

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