Measuring Time Through Celestial Movements and Earth's Orbit

The video explains how a year on Earth is measured, focusing on sidereal and tropical years. It discusses the effects of Earth's axial tilt, precession, and orbital eccentricity on seasons and climate. The video also covers the long-term cycles of Earth's orbit and their impact on ice ages.

What is a sidereal year measured against?

• The equinoxes

• The distant stars

• The Earth's axis

• The Moon

What is the path called that the Sun appears to move through the constellations of the zodiac?

• Solstice

• Equinox

• Ecliptic

• Analemma

What is the term for the path the Sun takes in the sky throughout the year?

• Analemma

• Ecliptic

• Zodiac

• Equinox

What are the days called when the Earth's tilt is perfectly sideways to the Sun?

• Aphelion

• Solstices

• Equinoxes

• Perihelion

What causes the precession of the Earth's axis?

• The Earth's orbit

• Gravitational forces of the Sun and Moon

• The Earth's rotation

• The Earth's tilt

Which star is currently the North Star due to the Earth's axial precession?

• Sirius

• Draco

• Polaris

• Vega

What is the measure of how round or oval the Earth's orbit is called?

• Axial tilt

• Orbital eccentricity

• Inclination

• Precession

How long does it take for the ellipse of Earth's orbit to revolve once relative to fixed stars?

• 100,000 years

• 112,000 years

• 41,000 years

• 26,000 years

What is the current angle of the Earth's axial tilt?

• 22.1 degrees

• 23.4 degrees

• 24.5 degrees

• 25.0 degrees

What cycle closely matches the 100,000-year pattern of ice ages?

• Axial precession

• Orbital eccentricity

• Inclination of Earth's orbit

• Axial tilt variation