Constellations and Earth's Motion

The video explains why we see different stars in the sky at different times. It demonstrates how to create a mini planetarium using an umbrella to visualize star movement. The video covers the role of Earth's rotation and orbit in changing star visibility, focusing on Polaris and seasonal constellations. It concludes by explaining how the Earth's orbit around the sun affects which constellations are visible throughout the year.

What tool is used to create a mini planetarium in the video?

• A telescope

• An old umbrella and sticky dots

• A flashlight

• A globe

How often does the Earth complete one rotation on its axis?

• 48 hours

• 24 hours

• 12 hours

• 72 hours

Which star is used as a reference point for northern constellations?

• Sirius

• Betelgeuse

• Vega

• Polaris

Why do northern stars appear to move around Polaris?

• Due to the Earth's rotation on its axis

• Because of the Earth's orbit around the sun

• Because Polaris is moving

• Due to the moon's gravitational pull

What happens to southern constellations as the Earth rotates?

• They change more than northern constellations

• They remain fixed in the sky

• They disappear completely

• They become brighter

Which constellation is visible when the sun is in Sagittarius during winter?

• Leo

• Orion

• Gemini

• Taurus

In which season is Virgo visible at night?

• Autumn

• Summer

• Spring

• Winter

What causes the sun to appear to move against the background of stars?

• The Earth's orbit around the sun

• The Earth's rotation

• The sun's own movement

• The moon's orbit

Which constellation is visible in summer when the sun is in Gemini?

• Capricorn

• Pisces

• Virgo

• Sagittarius

What is the main reason we see different constellations at different times of the year?

• The Earth's rotation

• The Earth's orbit around the sun

• The moon's phases

• The sun's brightness