Science 6: Motions of the Earth PDF

SCIENCE 6 Isla is doing her research work when she noticed a chat message from her cousin. Hi, Isla Hello, Zane! How’s your life in London? We’re doing great here cousin! What are you doing right now? I’m doing my research work. It’s 8:26 in the evening and I will really stay late tonight. Oh! I’m s...

SCIENCE 6 Isla is doing her research work when she noticed a chat message from her cousin. Hi, Isla Hello, Zane! How’s your life in London? We’re doing great here cousin! What are you doing right now? I’m doing my research work. It’s 8:26 in the evening and I will really stay late tonight. Oh! I’m sorry for disturbing you. It’s 26 minutes past 1 here in London. We are having a break. I saw you online. I miss you all in the Philippines. It’s alright cousin. Thanks for sending a message… I miss you, too. I have to go offline, cousin! We’re about to enter our room. Bye! Bye! Thanks, cousin. Give my regards to Auntie. Questions 1. What time was it in the Philippines when Zane chatted with Isla? 2. What was the time in London when they were having their chat? 3. Why do you think the time in the Philippines is not the same as the time in London? MOTIONS of the EARTH LEARNING OBJECTIVES: o differentiate rotation and revolution; and o describe the effects of the earth’s motion. The Earth as one among the planets in the solar system has two movements: Rotation Revolution Rotation (Daily Motion) o the spinning movement of the Earth on its axis in a west to east direction o axis is an imaginary straight line in which an object spins or rotates. Rotation (Daily Motion) o takes 23 hours 56 minutes and 4.2 seconds o inclined or tilted 23.5 degrees relative to its plane of revolution around the Sun Results of the Earth’s Rotation o occurrence of day and night o daily rising and setting of the sun, stars, and the moon Results of the Earth’s Rotation o affects the flow of air and water on Earth o flowing air and water are diverted from north-south direction to east-west direction o this called Coriolis Effect Revolution ( Annual Motion) o movement of the Earth around the sun on its orbit o an orbit is the Earth’s path as it revolves around the sun and is characterized by a slightly flattened circle called ellipse Revolution (Annual Motion) o the Sun is not at the center of the orbit but lightly off to one side, the reason why the Earth’s distance from the sun varies. Revolution (Annual Motion) o the Earth is closest to Sun at 147 million kilometers when it is in its orbit’s perihelion Revolution (Annual Motion) o the Earth is farthest from the Sun at 152 million kilometers when it is in its orbit’s aphelion o One complete revolution of the Earth is 365.24 solar days or 365 days 5 hours 48 minutes 46 seconds. o This explains why there is a leap year after every four years. Results of Earth’s Revolution o occurrence of seasonal changes SEASONS OF EARTH Seasons o are short periods of climatic changes caused by the amount of solar radiation an area receives o a division of the year marked with the changes in weather, hours of day, and ecology Because the Earth is tilted, different areas of the Earth receive different amount of solar radiation. The amount of solar radiation is constant near the equator, hence, in the tropics, there is not much seasonal temperature change. o During June, July, and August, the northern hemisphere is facing the sun, they are experiencing summer. o The southern hemisphere is away from the sun, they are experiencing winter. o June, July, and August are the hottest months in the northern hemisphere. o December, January, and February are the hottest months in the southern hemisphere. o When the sun is directly overhead at the equator, this is called an autumnal equinox. o Autumnal equinox happens on September 23 when the nighttime and daytime are equal. o During winter, days are short and nights are long. o Winter arrives with the winter solstice on December 21. From March, April, and May, the Earth’s axis is not pointed to the Sun. Both hemispheres receive an equal amount of solar energy. This season is called spring. o Spring in temperate countries starts on March 21. o In the northern hemisphere, the vernal equinox comes on March 21. o At this time, places in the northern hemisphere experience equal daytime and nighttime. https://www.youtube.com/watch?v=CqkQv617bcw