The transit of Venus from June 8, 2004, in this series of six
exposures taken in a 38 minute span beginning at 6:34 a.m. on
the left and ending at 7:12 am on the right, photographed in
Clinton County near Wilmington, Ohio. The second of the pair of
twice-a-century transits occurs on June 5 and 6, 2012, in the
afternoon and morning, respectively.
It will be an astronomical spectacle for the ages. On June 5
and 6, Venus will undergo a solar transit—for the last time in
our lives.
A transit occurs when a planet passes in front of the sun,
just as the moon passes between Earth and the sun during a
solar eclipse. The exact date that Venus will do so depends
on your vantage point. Viewers in the Western Hemisphere will
see the transit at sunset on June 5, while Eastern Hemisphere
observers will see it around sunrise on June 6.
Venus, being much farther away than the moon, will not even
remotely cover the sun during this journey. Instead, it will
pass across our home star as a small black dot.
Nevertheless, this process will result in a slight dimming of
the sun, scientists say.
Transits of Venus occur in pairs, eight years apart, once a
century. This is the second half of this century’s pairing; the
next one doesn’t occur until 2117. The 20th century missed
Venusian transits entirely, as the previous pair took place in
December 1874 and December 1882.
During a transit of Venus, the sun, Venus and Earth also
align in a straight line, according to the website
Transit of Venus.
Venus was prominent in many ancient cultures but was
especially important to the Mayans in Mexico and Central
America. Even without telescopes, the Mayans were able to
predict the movements of the spectacular object known popularly
as the morning (or evening) star with great accuracy, thousands
of years into the future. They may not have mapped a transit
per se, but they knew where the planet was going to be, and
when.
The Mayans venerated Venus as the basis of the god Kukulkan,
elsewhere known as Quetzalcoatl. Unlike its modern, Western
interpretation as the planet of love, the glittering orb was at
that time associated with war. The Mayans even used its
appearance to decide when to wage it. The evening version was
especially related to war calculations, notes the website
AuthenticMaya.com.
Several buildings in the iconic Mayan cities of Chichen-Itza
and Uxmal are oriented toward Venus’s path along the ecliptic,
and the planet’s journey to and fro across the sky was
calculated as far as
7,000 years into the future. As discoveries in the jungles
of Guatemala recently made clear, the calculations were scrawled
on a wall in a small room thought to be that of the town’s
scribe. Until this discovery was made in March, the Dresden
Codex contained most comprehensive writings on Venus from the
pre-Columbian era.
Known as Chak Ek’, Venus “was the astronomical object of
greatest interest,”
AuthenticMaya.com notes. “The Maya knew it better than any
civilization outside Mesoamerica.”
In fact, Venus was considered more important than the sun in
Mayan calculations.
“They watched it carefully as it moved through its stations,”
says AuthenticMaya.com. The ancients carefully noted the 584
days it takes for Venus and the Earth to line up “in their
previous position as compared to the sun. It takes about 2,922
days for the Earth, Venus, the sun, and the stars to agree.”
The Mayans even observed Venus in the daytime.
Although there are those in the indigenous world who will not
watch this rare celestial event because of its shadowy
connotations and a
taboo (among the Navajo, at least) against viewing the sun,
many people will be transfixed, and
transit of Venus viewing parties abound. Just remember:
Never stare directly at the sun. Instead, use a pair of
sun-filtering goggles (the same ones one would use during a
solar eclipse) or project the image through binoculars or a
telescope onto the ground in front of you.
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