Perihelion Explained: Earth's Closest Approach to the Sun

Perihelion refers to a specific point in the orbit of a planet or celestial body where it comes closest to the star it orbits. For Earth, the star is the Sun.

Understanding Earth's Orbit

• Earth's orbit around the Sun is not a perfect circle but rather an ellipse.
• An elliptical orbit means the distance between Earth and the Sun varies throughout the year.
• The point in this orbit where Earth is nearest to the Sun is called the perihelion.
• Conversely, the point where Earth is farthest from the Sun is called aphelion.
• Perihelion typically occurs in early January each year.
• Aphelion typically occurs in early July each year.

Analyzing the Options

Let's examine the given options in relation to the definition of perihelion:

• Option 1: under the sun - This description is vague and does not accurately represent Earth's position relative to the Sun in its orbit.
• Option 2: farthest from the sun - This describes aphelion, the opposite point in Earth's orbit from perihelion.
• Option 3: nearest to the sun - This is the correct definition of perihelion, the point where Earth is closest to the Sun.
• Option 4: above the sun - Similar to option 1, this description does not accurately define Earth's orbital position concerning its distance from the Sun.

Therefore, perihelion is when Earth is nearest to the Sun.