Lesson Notes By Weeks and Term v5 - Grade 5

Lesson Video

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Performance objectives

• Describe and illustrate the different phases of the Moon.
• Explain how the Moon orbits the Earth.
• Explain that Earth rotates on a tilted axis.
• Describe how the Earth's tilt causes the seasons.
• Identify the seasons in South Africa and their months.

Lesson summary

This week, we delve deeper into understanding the Moon and its relationship with Earth, as well as exploring the causes of our seasons. The Moon, our closest celestial neighbour, influences Earth in significant ways, particularly tides. Understanding its phases and movements allows us to predict natural events and appreciate the beauty of our solar system. Similarly, the seasons dramatically affect life in South Africa, from agriculture and clothing choices to the animals we see and the festivals we celebrate. We need to understand why we experience these predictable changes in weather patterns throughout the year.

Lesson notes

The Moon's Phases: The Moon does not produce its own light; it reflects light from the Sun. As the Moon orbits the Earth, we see different amounts of the illuminated surface, causing the phases of the Moon. The cycle of phases takes approximately 29.5 days (a lunar month).

The main phases are: New Moon: The Moon is between the Earth and the Sun. We cannot see the Moon because the side facing us is not illuminated.

Waxing Crescent: A small sliver of the Moon becomes visible, growing larger each night. "Waxing" means growing.

First Quarter: Half of the Moon appears illuminated.

Waxing Gibbous: More than half of the Moon is illuminated, but it's not yet full.

Full Moon: The entire Moon is illuminated.

Waning Gibbous: After the full moon, the illuminated portion starts to decrease. "Waning" means shrinking.

Third Quarter: Half of the Moon appears illuminated (the opposite half from the First Quarter).

Waning Crescent: A small sliver of the Moon remains visible, shrinking each night until it disappears at the next New Moon. Mnemonic Device (for remembering phases in order): New, Waxing Crescent, First Quarter, Waxing Gibbous, Full, Waning Gibbous, Third Quarter, Waning Crescent.

Example: Imagine you're making a sandwich. The New Moon is like no filling at all. As you add more filling (Waxing Crescent, First Quarter, Waxing Gibbous), the sandwich gets thicker until it's a Full sandwich. Then you start eating it (Waning Gibbous, Third Quarter, Waning Crescent) until it's all gone (back to New Moon).

The Moon's Orbit: The Moon orbits the Earth in an elliptical path (an oval shape, not a perfect circle). This orbit takes roughly 27.3 days (sidereal month). The difference between sidereal and lunar month is that the Earth also moves around the Sun in the meantime. This movement is important because the Moon's gravitational pull on Earth is what causes tides, the rise and fall of sea levels.

Earth's Tilt and Seasons: The Earth is tilted on its axis at an angle of approximately 23.5 degrees. This tilt is the primary reason for the seasons. As the Earth orbits the Sun, different parts of the planet are tilted towards or away from the Sun. When the Northern Hemisphere (where Europe and North America are located) is tilted towards the Sun, it experiences summer, while the Southern Hemisphere (where South Africa is located) experiences winter. The Northern Hemisphere receives more direct sunlight, making it warmer. When the Southern Hemisphere is tilted towards the Sun, it experiences summer, and the Northern Hemisphere experiences winter. The seasons are opposite in the Northern and Southern Hemispheres.

Seasons in South Africa: South Africa experiences the following seasons: Summer: December to February (hottest months). Days are longer, and the Sun is high in the sky. This is when the Southern Hemisphere is tilted towards the Sun.

Autumn (Fall): March to May. Temperatures start to cool down, and leaves on some trees change color and fall.

Winter: June to August (coldest months). Days are shorter, and the Sun is lower in the sky. This is when the Southern Hemisphere is tilted away from the Sun.

Spring: September to November. Temperatures start to warm up, and plants begin to grow again. Flowers bloom.

Example: Think about clothing. In Summer (December), you're likely wearing light, breathable clothing like shorts and t-shirts. In Winter (June), you need warm clothes like jackets, scarves, and gloves to stay comfortable. Why does the tilt cause seasons? A direct ray of sunlight gives more heat than a ray that hits the Earth at an angle. When a hemisphere is tilted towards the Sun, it receives more direct sunlight, leading to warmer temperatures and longer days. When a hemisphere is tilted away, it receives less direct sunlight, resulting in cooler temperatures and shorter days. Guided Practice (With Solutions)

Question 1: If today is the First Quarter Moon, what phase will the Moon be in approximately one week from now?

Solution: After the First Quarter, the Moon progresses to Waxing Gibbous, then Full Moon. One week from the First Quarter, it will be approximately the Full Moon phase.

Commentary: This question tests understanding of the order of Moon phases.

Question 2: Explain why South Africa experiences winter when countries in Europe and North America experience summer.

Solution: The Earth is tilted on its axis. When the Northern Hemisphere (where Europe and North America are located) is tilted towards the Sun, it's summer there. At the same time, the Southern Hemisphere (where South Africa is located) is tilted away from the Sun, resulting in winter.

Commentary: This question requires explaining the relationship between Earth's tilt and the seasons in different hemispheres.

Question 3: In which month is the Sun highest in the sky in South Africa?

Solution: The Sun is highest in the sky in South Africa during summer, specifically in December.