എസ്എസ്എൽസി പരീക്ഷാ സഹായി (സോഷ്യൽ സയൻസ് II –പാർട്ട് 1

Seasons & Time 

Hi students, we are going to analyse the 1st unit of Geography 'Seasons & Time'. By simply going through the figure given, we can easily find out answers for more than 10 questions! 

Revolution: 

In an elliptical orbit the Earth revolves around the Sun. This is known as Revolution. 

Parallelism  of the Earth's Axis: 

The Earth maintains its tilt (66½ ᵒ  from the orbital plane and 23½ ᵒ from Vertical plane) throughout its revolution. This is known as the Parallelism of the Earth's Axis. 

Apparent Movement of the Sun: 

Since the parallelism is maintained throughout the revolution, the position of the Sun in relation to the Earth varies apparently between Tropic of Cancer ( 23½ ᵒ N) and Tropic of Capricorn ( 23½ ᵒ S). This is known as the Apparent Movement of the Sun. 

Equinoxes: 

On March 21st and September 23rd the apparent position of the Sun is vertically over the equator. The length of the day and night will be equal during these days on both the hemispheres. These days are called Equinoxes. 

Summer Solstice: 

From 21st March on wards, the Sun apparently shifts from the equator northwards and reaches vertically over the tropic of Cancer  ( 23½ ᵒ N) on 21st June. This day is known as Summer Solstice, in the Northern hemisphere. 

Winter Solstice: 

The Sun continues its southward apparent shift from the Equator from 23rd September and reaches vertically above tropic of Capricorn ( 23½ ᵒ S) on 22nd December. This day is known as Winter Solstice. 

Spring Season: 

Spring season is a season of transition from winter to summer. The Northern hemisphere experiences this season from 21st March and 21st June. 

Peculiarities of this season 

∙ Plants sprouting 

∙ Mango trees blooming 

∙ Jack fruit trees bearing buds 

Autumn Season: 

Autumn makes the transition from the severity of Summer towards Winter. It experience from 23rd September to 22nd December in the Northern hemisphere. 

Peculiarities of this season 

∙ Shortening of day and lengthening of night. 

∙ Trees generally shed their leaves. 

Summer Season: 

The Southward  apparent movement of the Sun begins from 21st June and again reaches vertically above the Equator on 23rd September. This is the Summer season in the Northern hemisphere. 

Winter Season: 

The Northward apparent shift of the Sun begins by 22nd December and again reaches vertically above the Equator on 21st March. This is the Winter Season in the Northern hemisphere. 

Utharayanam: 

Following the winter solstice, the Sun sets its Northward apparent movement from Tropic of Capricorn (23½ ᵒ S) and it culminates on Tropic of Cancer ( 23½ ᵒ N) on 21st June. This northward apparent movement of the Sun from the Tropic of Capricorn to Tropic of Cancer is known as 'Utharayanam'. 

Dakshinayanam: 

Following the Summer solstice, the Sun sets its southward apparent movement from Tropic of Cancer ( 23½ ᵒ N) and it culminates on Tropic of Capricorn ( 23½ ᵒ S) on 22nd December. This southward apparent movement of the Sun from Tropic of Cancer to Tropic of Capricorn is known as Dakshinayanam.

Dear students, don't forget to refer the model questions in Padippura. Mail your doubts to Padippura.. All the best..

English Summary : SSLC pareeksha sahayi- Social science II part 1