Explore topic-wise InterviewSolutions in Current Affairs.

June 21:

• Longest day in the Northern Hemisphere. 
• Longest night in the Southçrn Hemisphere.

December 22:

• Longest day in the Southern Hemisphere. 
• Longest night in the Northern Hemisphere.

June 21

• Known as summer solstice in Northern Hemisphere. 
• The longest day and the shortest night in the Northern Hemisphere. 
• The longest night and the shortest day in the Southern Hemisphere.

December 22

• Known as winter solstice in Northern Hemisphere. 
• The longest day and the shortest night in the Southern Hemisphere. 
• The longest night and the shortest day in the Northern Hemisphere.

Kerala is a place located near the equator since Kerala receives high amount of sunlight in every year. In such regions seasons are not distinctly felt.

The wrong statement is B. 

The duration of night in the Southern Hemisphere decreases from Septembers 23 to December 22.

On June 21 the Southern hemisphere experiences its longest night and shortest day.

• The atmospheric temperature increases.
• Rivers, ponds, springs and other water sources get dried up.
• Availability of rain becomes reduced. As a result, land gets parched.
• Shortage of food materials.
• The grasslands dry up.

A. Autumn season 

B. Spring season 

C. Winter season 

D. Summer season

The duration of day in the southern hemisphere gradually increases during this period.

If 180° longitude passes through the country A, the places situated East and West of this line will be having two different days. Think about the practical difficulties caused by this. To avoid this, certain necessary adjustments have been effected in this line with the result that it doesn’t pass through the corresponding land areas. Note the longitude marked with broken lines.

The line is in such a way that it passes through Bering – strait in Pacific Ocean and avoid some of the inhabited islands. The travelers who cross this line from the West calculate the time by advancing it by one day and those who cross the line from the west deduct one day. This imaginary line is known as the International Date Line. A can cross this line from the West calculate the time by advancing it by one day, take it as Friday.

Longest day and shortest night.

The earth rotates from west to east. So, the sun rise first in the Eastern longitude. We calculate time by considering the time when sun reaches the highest point in the sky as 12’0 clock. So when we consider Greenwich line as the base line for time, it becomes noon early in the Eastern longitudes. That is why eastern longitudes feel the time is getting increased. But in western longitudes noon will be after the noon in Greenwich.

• There is a difference of 24 hours on either side of this longitude.
• If this line passes through land areas, the same inhabited areas may have different days.

Time is behind the GMT at places lying to the west of Greenwich line. For every 15° longitude, the time decreases by 1 hour. So the time at 75 °W is 5 hours behind GMT. \(\frac{75}{15}\) = 5

The time at Greenwich = Monday 4 am The time at 75 °W = 5 hours behind GMT The time and day = Sunday 11 pm;

Other lines of longitudes are straight lines. But International Date line is not a straight line. The international dateline passes through the Pacific ocean. It deviates from the 180° longitudes where it crosses land in order to keep all the lands under one administration on one side of the dateline. The Dateline deviates. Eastwards in the Bering straits between Australia and Siberia. The line deviates west-wards of 180° longitude. Further south, the date line deviates eastwards of 180° around Fiji, Toga islands.

The continents situated to the west of the international Date Line are Asia and Australia. North America and South America lie to, the east of the International Date Line. The travelers who cross International Date Line and go to North America and South America will gain one day.

A barter system is known as an old method of exchange. This system has been practised for centuries and long before money was introduced. People started exchanging services and goods for other services and goods in return. The value of bartering items is negotiable with the other party.

Correct answer is (ii) Spring 

Variations in the amount of sunshine received are the basis for the occurrence of different seasons. The earths revolution and the tilt of the axis are the reasons for this variation.

The apparent movement of sun between the Tropic of Cancer and the Tropic of Capricorn is the reason. 

When the sun is over the northern hemisphere, longer days and shorter nights are experienced here.

When the sun is over the southern hemisphere, the northern hemisphere experiences shorter days and longer nights. This causes variations in the time of sunrise and sunset.

Leap year: 

The earth takes 365 days and 6 hours to complete one revolution. 365 days are included in a normal year and by adding the rest 6 hours together one additional day is included in the fourth year which is in February (29 days).

The axis of the earth is inclined to 661/2° from the plane of the orbit and it is 23 1/2 ° from the vertical to the plane of orbit

The west and east of 180° longitude line records two different times with 24 hours difference. This creates much difficulties. So land areas along the 1800 longitude are avoided and the longitude passes through ocean.

82 \(\frac{1}2º \) E longitude

The apparent position of the sun during the earth’s revolution will be over the equator on March 21 and September 23. Hence the length of the day and night will be equal during these days on both the hemispheres. These days are called equinoxes. 

The length of the days and night all over the earth would be equal.

The axis of the earth is tilted at an angle of 66 1/2 from the orbital plane. If measured from the vertical plane this would be 23 1/2.The earth maintains this tilt throughout its revolution. This is known as parallelism of earth’s axis.

Revolution of the earth, rotation of the earth, tilt of the axis and inclination of the axis in the same direction.

The regular occurrence of day and night will | not be possible. The side of the earth which j for as the sun always feel day and the other | side always will have night. If the earth stops j rotation, it will become an unsuitable planet j to sustain life.

Angular distance of the earth when it complete one rotation is 360°.

24 hours, 1440 minutes

The earth rotates its own axis is known as rotation.

24 hrs time does the earth take to complete one rotation.

To complete one revolution, the earth takes 365 1/4 days. But a year normally has 365 days. The remaining 1/4 part of a day will be considered as a full day one in every fair year. Thus every fourth year has 366 days and is called a leap year. Thus in every fourth year February has 29 days.

To complete one revolution, the earth takes 365 1/4 days. But a year normally has 365 days. The remaining 1/4 part of a day will be considered as a full day one in every fair year. Thus every fourth year has 366 days and is called a leap year. Thus in every fourth year February has 29 days.

When sum is over head over the equator on March 21 and September 23, the length of the day and night will be equal on both the hemisphere. These days are called equinoxes.

Correct option: b. Tilt of the Earth’s axis

365 1/4 days time does the earth take to complete one revolution

lt will be six months of days throughout in the places within the Antarctic circle.

During the period from March to September, as the Sun is in the Northern Hemisphere, the south polar regions experience continuous night for six months.

During the remaining period, that is from September to March, as the Sun is in the Southern Hemisphere south polar regions experience continuous day light for six months.

No, The time estimated at each place based on the apex position of the sun is termed as the local time.

• The zero degree longitude is known as Greenwich line. Time is calculated worldwide based on the Greenwich line. Hence this line is also known as prime meridian.
• Based on the Greenwich line, the world is divided into 24 time zones. The local time at the Greenwich line is known Greenwich Mean Time.

The northward apparent movement of the sun from Tropic of Capricorn to Tropic of Cancer is termed as Utharayanam. The duration of day in the Northern Hemisphere gradually increases during this period. The duration of day in the Southern Hemisphere gradually decreases.

The southward apparent movement of the sun from Tropic of Cancer to Tropic of Capricorn is termed as Dakshinayanam. The duration of day in the Northern Hemisphere gradually decreases and that of Southern Hemisphere gradually increases.

• Based on the Greenwich line, the world is divided into 24 time zones, each with a time difference of one hour. 
• The longitudinal extent of each time zone is 15°.

83°30 E is the standard meridian of India.

The 82 1/2 °E longitude which passes almost through the middle of these longitudes has been fixed as the standard meridian of India. The time difference between Indian Standard Time and Greenich Mean Time is 5 1/2 hours ahead.

Cannot prepare a railway time table applicable throughout the country.

• Cannot give announcements about radio programs.
• Peoples have to adjust their watches suitably. 
• Cannot organize a All India Exams.

Each country in the world considers the longitude that passes almost through its middle as the standard meridian.

8214° East longitude