alleryThe semimajor axis of an orbit is half the distance from:
AFocus to focus
BSun to planet
CCentre to edge
DNear to far point
Answer & Solution
Correct answer: D. Near to far point
1. The line from perihelion to aphelion crosses the whole ellipse.
2. The semimajor axis is half of it.
3. So it is half the distance from the near to the far point.
_Source: syllabus Physics Part I, Chapter 8, Gravitation._
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