explain the topic of chapter 2 measurements of large distance
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Explanation:
To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when Earth is on opposite sides of the Sun in its orbit.
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The commonly used units to measure larger distances are : Astronomical unit, light year and Parsec
Explanation:
✓Astronomical unit is equal to the mean distance between earth and sun.
✓Light year is the distance travelled by light in vaccum in one year.
✓Parsec is the distance from where the semi major axis of orbit of earth subtends an angle of one second.
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