The twice-in-a-lifetime event: Transit of Venus 2012 ng/objects/daylightphenomena/3308756.ht ml.

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Presentation transcript:

The twice-in-a-lifetime event: Transit of Venus ng/objects/daylightphenomena/ ht ml

Venus takes days to orbit the sun Earth takes days (1 calendar year) Earth, sun and Venus are realigned every days, a synodic year 5 Venus synodic years  8 Earth calendar years

Venus’ 5 synodic years since 2004

Why isn’t there a transit every inferior conjunction? For a transit, Earth, Venus and the sun must line up almost EXACTLY in all 3 dimensions Venus’ orbit plane is tipped with respect to Earth’s – the planes intersect at 2 points (Earth’s location in June & December)

8 years from now? Graphics and reality checks from Royal Astronomical Society of New Zealand’s web page on Venus transit

Why has this been an important event in astronomical history?

A means to measure the scale length of the solar system Copernicus supplied correct scale model of the solar system; he did not know that the “scale unit” (the AU, or Astronomical Unit) was about 150,000,000 km

If Earth is 1 AU from the sun, Venus’s average distance from sun is 0.62 AU At inferior conjunction, Venus is 0.28 AU from Earth

Now we’re cooking: