Home Plan - [GR2-L9-U1-LC1-21 The Sun, Earth, and Moon]

The document covers Level 9 Lesson 21, detailing the intricate relationships between the movements of the Earth, Moon, and Sun. It explores concepts such as rotation, revolution, tides, gravity, and eclipses, emphasizing the importance of visualization and inference-making in learning. It discusses Earth and Moon movements affecting day-night cycles, leap years, and gravitational pulls causing tides, as well as explaining leap years, seasons due to Earth’s tilt, synchronous rotation of the Moon, and the phenomenon of total solar eclipses. It provides insights into the historical significance of leap years and Pope Gregory XIII’s calendar adjustment, underlining safety precautions for observing solar eclipses and introducing lunar eclipses as well.

Contents

• Pages 1—24: Earth, Moon, Sun
• Pages 25—42: Earth’s motion explained.
• Pages 43—53: Solar eclipses explained.

This section of the document introduces the topic of Level 9 Lesson 21, which focuses on the relationship between the movements of the Earth, Moon, and Sun. The section starts with learning objectives and words to know. It discusses rotation, revolution, tides, gravity, eclipse, and other related terms. The document emphasizes the importance of visualizing, making inferences, and drawing conclusions while reading. It delves into the movements of the Earth, explaining rotation and revolution, and how they affect day and night cycles and the calendar. The text also briefly mentions leap years and their historical significance. Additionally, the document includes activities for students to practice comprehension skills by matching words with their definitions, filling in blanks with the correct words, and making inferences using provided clues.

This section of the document discusses Earth’s revolution around the sun, which takes about 365 days. The concept of leap years is explained, where an extra day is added to February every four years to align the calendar with the seasons. Leap years date back to ancient Rome and were refined by Pope Gregory XIII in 1582. It also explains Earth’s axis tilt of about 23.5 degrees causing seasons in different hemispheres. The section further talks about the rotation and revolution of the Moon, synchronous rotation, and how the Moon always shows the same face to Earth. It ends by discussing how the gravitational pulls of the Sun and Moon cause tides on Earth.

This section of the document discusses solar eclipses, specifically total solar eclipses, which are noted as one of the most spectacular sights on Earth. It explains that during a total solar eclipse, the Moon passes between the Earth and the Sun, blocking the Sun’s disk completely for a few minutes. The Sun’s corona, its outer glowing gases, become visible during this time. While most people see a partial eclipse where part of the Sun’s disk is still visible, those in a narrow path experience a total eclipse. Protective glasses are advised when viewing any type of solar eclipse. This section also briefly introduces the concept of lunar eclipses and the alignment of the Earth, Moon, and Sun.