I believe June 17-19, 2012 is the Day of Illumination and the fulfillment of the 1st degree Masonic tracing board, during which Jacob's Ladder reappears and the lost key of Freemasonry will be found:
The 1st degree Masonic tracing board is about an astronomical event that happens in the constellation Taurus where the Pleiades/M45 (or the seven stars) is located.
The tracing board shows the rising Sun on the left, the waning/new Moon with the seven stars on the right, and the All-seeing Eye representing Aldebaran in the middle located at the East.
Aldebaran (the eye of Taurus, the Bull) is the watcher of the East, and one of the 4 royal stars of ancient Persia.
http://en.wikipedia.org/wiki/Royal_stars
The 3 pillars with varying heights represents the 3 brightest celestial bodies
after the Sun and the Moon, namely:
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Venus, the brightest of the 3, represented by the tallest pillar marked B for beauty,
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Jupiter, the second brightest of the 3, represented by the second tallest pillar marked S for strength,
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Sirius, the third brightest of the 3, represented by the third tallest pillar marked W for wisdom.
These 3 pillars also represent Osiris, Horus, and Isis as seen in the following image:
Notice how Isis (Venus) is the tallest of the 3 gods, followed by Osiris (Jupiter), and then by Horus (Sirius).
On June 17-19, 2012, Venus, Jupiter, the Sun and the Moon will be gathered together in the constellation Taurus (June 17 is when the Moon enters the constellation and June 19 is when the Moon leaves it). Sirius is located in Canis Major which is a minor constellation of Taurus.
Venus will also be in retrograde motion at this time, meaning its motion is opposite that of Jupiter, which explains why Isis is looking at the opposite direction of where Osiris is facing.
If the tracing board prophecy will indeed be fulfilled on June 17-19, then this means Jacob's ladder and the lost key of Freemasonry will also reapper on these dates. This ladder represents ascension and transformation from human imperfection to human perfection.
Notice the imperfect block of stone at the left of the center pillar marked W and the perfect block of stone at its right.
One of the immediate result of this Day of Illumination will be the plan to build the third temple in Jerusalem which is seen lying between the 2 pillars marked S and B.