Which example demonstrates the minuscule angle to be measured in parallax experiments?

Which example demonstrates the minuscule angle to be measured in parallax experiments?

• A. The size of a grain of sand seen from several meters away
• B. Lincoln's nose on a penny in San Francisco, viewed from New York
• C. A star's parallax measured with a satellite
• D. A coin on the Moon seen from Earth

Answer: (B)

Parallax is all about how much an object's position appears to shift when you change your viewing point, and the angle of that shift is typically very small in real astronomical measurements. The penny example—Lincoln’s nose on a penny seen from opposite sides of the country—puts two very different viewpoints on the same nearby object and lets the nose appear to shift against the distant background. That tiny shift against faraway features is exactly the kind of small angular measurement parallax experiments are designed to detect. It’s a tangible, everyday illustration of how changing vantage points yields a measurable, minuscule angle. For context, scientists aim to measure tiny parallax angles for distant stars, which is why space-based instruments are used to avoid atmosphere and achieve the precision needed. The other scenarios involve either larger apparent sizes or conceptually different demonstrations of parallax, whereas this two‑viewpoint penny example directly captures the idea of detecting a small angular shift resulting from a change in perspective.

Parallax is all about how much an object's position appears to shift when you change your viewing point, and the angle of that shift is typically very small in real astronomical measurements. The penny example—Lincoln’s nose on a penny seen from opposite sides of the country—puts two very different viewpoints on the same nearby object and lets the nose appear to shift against the distant background. That tiny shift against faraway features is exactly the kind of small angular measurement parallax experiments are designed to detect. It’s a tangible, everyday illustration of how changing vantage points yields a measurable, minuscule angle.

For context, scientists aim to measure tiny parallax angles for distant stars, which is why space-based instruments are used to avoid atmosphere and achieve the precision needed. The other scenarios involve either larger apparent sizes or conceptually different demonstrations of parallax, whereas this two‑viewpoint penny example directly captures the idea of detecting a small angular shift resulting from a change in perspective.