Day and Night Patterns Chapter Notes | Science & Technology for Grade 1 PDF Download

Day and Night Happen Because Earth Spins

• The Earth spins like a top, and this spinning makes day and night.
• When our part of the Earth faces the Sun, it is daytime, and we see sunlight.
• When our part of the Earth faces away from the Sun, it is nighttime, and it gets dark.
• The Earth takes about 24 hours to spin one full time, which is why we have a new day every 24 hours.

The Sun’s Pattern

• The Sun looks like it moves across the sky every day in the same way.
• In the morning, the Sun rises in the east, where the sky starts to get bright.
• By midday, the Sun is high in the sky, and it is the brightest time of the day.
• In the evening, the Sun sets in the west, and it starts to get dark.
• This pattern of the Sun rising, moving, and setting happens every day.
• We can guess when the Sun will rise or set because it follows this pattern.

The Moon’s Pattern

• The Moon also looks like it moves across the sky every day.
• It rises in the east, like the Sun, and sets in the west.
• Sometimes, we can see the Moon during the day, not just at night.
• The Moon’s shape changes over a month; these shapes are called phases.
• Even though the Moon’s shape changes, it still moves across the sky in a daily pattern.

The Stars’ Pattern

• We see stars at night because the Sun’s bright light is not there to hide them.
• Stars look like they move across the sky, just like the Sun and Moon.
• Stars rise in the east, move across the sky, and set in the west.
• The Earth’s spinning makes it look like the stars are moving.
• Stars stay in the same groups, called constellations, but they seem to move because of the Earth’s spin.

Shadows and the Sun

• Shadows are dark shapes that happen when something blocks the Sun’s light.
• As the Sun moves across the sky, shadows change.
• In the morning and evening, when the Sun is low, shadows are long.
• At midday, when the Sun is high in the sky, shadows are short.
• The direction of shadows also changes as the Sun moves during the day.

Why Patterns Matter

• Patterns help us know what will happen next in the sky.
• For example, knowing the Sun rises in the east helps us plan our morning.
• Scientists, like astronomers, look at these patterns to learn more about space.
• By watching the Sun, Moon, stars, and shadows, we can predict what they will do next.