alleryTo find a planet's distance, it is observed from positions numbering:
AOne
BFour
CNine
DTwo
Answer & Solution
Correct answer: D. Two
1. Parallax compares the directions to the object.
2. One direction alone gives no distance.
3. So it is observed from two different positions.
_Source: syllabus Physics Part I, Chapter 2, Units and Measurement._
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