When Venus came to million kilometers to Earth, it is the closest distance to Earth achieved by any planet. So after that event, how long does it take for the event to happen again?
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That happens when the Earth’s Perihelion & Venus’ Aphelion come in opposition (Venus transit adds to it, but that will be the third factor). That is
( – eₑ) – a(+eₔ) = ( -.) – .(+.) = . – . = . AU
= ,, km.
Now the synodic period of Venus (w.r.t. Earth) is
= (/Venus Year in Earth days) – (/Earth year)
= (/.) – (/.)
= /.,
implying it as once every . days (between two Earth opposition as observed from Venus).
The above mentioned closest approach occurs in one of those such periods. Someone in NASA must be having the figure.
The two planets are closest, called inferior conjunction, every . days, called their synodic period. Both planets have orbits very close to circular, so there’s little variation in distance from one conjunction to the next.
Source(s): RASC Observer’s Handbook
About a day or two, when it will crash into us.
. days.
Edit: Poor is right. I actually started with the synodic year, . days — the value you wanted, and calculated venus’ orbital period.
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Source(s): [n] = ⁿ