[Music] [Music] good day for this video presentation we will learn about earth rotation and revolution what can you say about this video clip [Music] [Applause] that's right earth is in constant motion it moves in two ways rotation and revolution rotation is the movement of the earth on its axis the earth's axis is an imaginary line that runs through earth from the north pole to the south pole earth the earth rotates from west to east it is clockwise as seen above north pole and counterclockwise as seen above south pole the earth completes one rotation every 24 hours or one day this motion of the earth causes day and night what can you say about this video clip [Music] that's right revolution is the movement of earth around the sun the path followed by the earth around the sun is called orbit the earth [Music] earth orbit is not a perfect circle it is slightly elliptical this explains why earth's distance from the sun varies it is closest to the sun at 152 million kilometers when it is in its orbits perihelion it is farthest from the at 152 million kilometers when it is in its orbits of helium the period of one revolution around the sun is defined as a year it takes the earth 365 and one quarter days to revolve around the sun our calendar shows only 365 days in a year however here however every four years one day is added to february instead of 28 days february has 29 days every four years when february has 29 days we have a leap year elite year has 366 days a year which is divisible by 4 is a lead year this six hour is responsible for our year every four years it is called leap year and now let's answer the following question choose the letter of the correct answer 1. how many hours will it take the earth to have one complete rotation on its own axis a 12 hours b 24 hours c 6 hours d 18 hours you have 5 seconds to answer [Music] two how many days will it take the earth to complete one complete revolution around the sun a 340 days b 365 and one quarter days c 390 days d 365 and one half days you have five seconds to answer [Music] [Applause] [Music] three how does the earth revolve around the sun a clockwise b counterclockwise c circular direction d any direction you have five seconds to answer four does the earth rotate on its axis while revolving around the sun a yes b no c maybe d perhaps you have five seconds to answer five what will you use to observe the revolution of the earth around the sun a model of the solar system b model of the layers or the earth c model of the earth revolving around the sunday d none of the above you have five seconds to answer [Music] very good next identify the words being referred to choose your answer form the words below aphelion rotation perihelion axis revolution orbit one earth motion around the sunday two imaginary line describing earth's tilt three earth's path around the sun four earth orbit closest to the sunday 5. earth orbit farthest to the sun you have 25 seconds to answer [Music] [Applause] time's up and now let's do your performance task complete the table below column 1 rotation column 2 revolution row 1 illustration row 2 time to complete the motion row 3 effect [Music] [Applause] thank you for watching don't forget to like share and subscribe you