MOTION OF THE EARTH

THERE ARE TWO TYPE OF MOTION THE EARTH PERFORMS.
ONE IS ROTATION AND OTHER IS REVOLUTION.
ROTATION IS AROUND THE AXIS AND REVOULTION IS AROUND THE FIXED PATH THAT EARTH COVER AROUND THE SUN.
THE AXIS OF EARTH WHICH IS AN IMAGINERY LINE MAKES AN ANGLE OF 66 1/2 DEGREE WITH THE ORBITAL PLANE.
DUE TO THE SPEHERICAL SHAPE,HALF OF THE EARTH REMAIN IN DAYTIME AND HALF OF THE EARTH REMAINS NIGHT.
THE CIRCLE THAT DIVIDE THE DAY AND THE NIGHT IS CALLED CIRCLE OF ILLUMINATION.
THE EARTH TAKES ABOUT ONE DAY TO ROTATE ON ITS AXIS.

EARTH TAKES 365 1/4 DAYS TO REVOLVE AROUND THE SUN.
HAVING  SAID THAT WE COUNT THIS 1/4 i.e 6 HOURS AS IGNORED AND AFTER FOUR YEAR IT HEAP UP TO ONE DAY AND HENCE THERE IS EXTRA DAY IN FEBUARY AND THAT YEAR IS CALLED LEAP YEAR.
INDIA LIES IN THE NORTHERN HEMISPHERE AND NOT IN THE SOUTHERN HEMISPHERE.
TROPIC OF CANCER LIES IN THE INDIA.
TROPIC OF CAPRICORN DOES NOT LIES IN INDIA.
ON 21st JUNE,NORTHERN HEMISPHERE IS FACING TOWARD THE SUN AND THE AREA IN NORTHERN HEMISPHERE IS HOT.
ON 21st JUNE,TROPIC OF CANCER  REGION IS HOT.
ACROSS THE YEAR,THE RAYS OF SUN IN THE POLE REGION IS SLANTING AND HENCE THEY ARE COLD.
THE LONGEST DAY AND SHORTEST NIGHT IN THE NORTHERN HEMISPHERE IS ON 21st JUNE.
AT THIS TIME,THE CONDITION IN THE SOUTHERN HEMISPHERE IS JUST REVERSED.
THIS POSITION OF EARTH IS CALLED SUMMER SOLISTICS.

ON 22nd DECEMBER,THE TROPIC OF CAPRICORN RECEIVE THE DIRECT SUN LIGHT.
THESE AREA IN SOUTHERN HEMISPHERE ARE HOTTEST IN THIS TIME.
THIS POSITION OF EARTH IS CALLED WINTER SOLITICS.

ON 21 MARCH AND 23 SEPTEMBER,EQUATOR RECEIVE THE DIRECT SUN LIGHT.
THE WHOLE EARTH HAVE EQUAL DAY AND EQUAL NIGHT.
THIS IS CALLED EQUINOX.
ON 23rd SEPTEBER,AUTUMN IS IN NORTHERN HEMISPHERE AND SPRING IN THE SOUTHERN HEMISPHER.
SIMILARLY,ON 21st MARCH,SPRING IS IN NORTHERN HEMISPHERE AND AUTUMN IS IN NORTHERN HEMISPHERE.