Besides the structure in Pompei which inspired the Map Room in Raiders, Astronomy helped shape the life of early man.
The Winter Solstice will be taking place at the same time as the Lunar Eclipse Tuesday. This will be the first time that the two phenomenon's have taking place at the same time in 456 years. NASA claims the last time that happened was AD 1554.
The eclipse is scheduled to take place in the early morning hours on Tuesday, December 21st and the weather is expected to be clear. The last lunar eclipse took place back in 2008, the next one will not occur until 2012.
What causes lunar eclipses, and why do they occur on an irregular schedule?
Unpredictability is at the heart of eclipse lore. For the ancients, a lunar eclipse was a haunting event. Some believed a dragon of the sky was eating the moon, flooding it with blood before consuming it entirely. Of course it always came back, and that fueled more speculation.
Here are nine cool facts about the dark history of lunar eclipses and how they really work.
Thankfully the weather co-operated for this years Leonid Shower, and I took the family out to watch. Hopefully this will be as fantastic. Will you be watching?
Alan Boyle writes:It seems that the world was shocked to learn this week that astrology no longer reflects astronomical realities. But such shifts are merely part of the routine in a changing universe. They don't always come to our attention, but they can make more of a difference in your daily life than your horoscope.
Parke Kunkle, an astronomer who teaches at Minneapolis Community and Technical College, set off an Internet-wide viral buzz when the Star-Tribune published his observation that the constellations don't match the traditional astrological signs. Back in the days of Babylonian soothsayers, the sun might have been in the constellation Capricorn at this time of year. But due to the changing tilt of Earth's axis, it's actually in Sagittarius right now.
Today, Kunkle told MSNBC that his phone has been ringing off the hook — and he doesn't know why this has turned into such a big deal. "What we've been doing is just a standard astronomy lesson that we talk about in every astronomy class," he said.
Over the course of thousands of years, Earth's axis wobbles like a top, and as a result the apparent position of the sun against the constellations varies. The boundaries of the constellations have become more sharply defined as well, which means the sun doesn't spend equal amounts of time in each of the zodiacal "signs." In fact, the sun passes through a 13th constellation — Ophiuchus the serpent bearer — which throws off the whole traditional 12-house system that astrologers swear by.
Of course, most people don't give any credence to astrology, with or without Ophiuchus. A 2005 Gallup Poll found that only about a quarter of Americans believe that the position of stars or planets can affect their lives. And even if you are a believer, the planetary shift doesn't magically transform you from a Virgo to a Leo. "This doesn't change your chart at all," Shelly Ackerman, an astrologer and spokeswoman for the American Federation of Astrologers, told The Associated Press.
The same advice holds for other astrological systems. For example, it's still the Chinese Year of the Tiger (well, at least until February). The fact is that the practice of astrology is separate from the modern science of astronomy, even though ancient cultures spent so much effort on astronomy mainly so that astrologers could do their job better.
Earth's cosmic shifts have had other effects as well. Just for luck, here are seven examples:
Changing pole star: Another effect of Earth's wobbling axis is that different stars have served as the guide star for our planet's geographical north pole throughout history. During the heyday of the Egyptian pharaohs, for example, other stars took on the role of the pole star, an "undying" star that never set. This is thought to be the reason why the Great Pyramid of Khufu was built with a passageway that pointed to the star Thuban in the constellation Draco, which was the star closest to the north pole when Khufu died, around 2566 B.C. Later on, the pole stars were Kochab and Pherkad in the constellation Ursa Minor. Today it's Polaris, but the bright star Vega had its turn around 12,000 B.C. and will be the pole star once again in the year 13,727 or so.
Changing magnetic poles: Last week's big geophysical story had to do with the gradual shift of Earth's magnetic north pole away from Canada and toward Russia. The poles move because of the changing flow of molten iron in Earth's core, which drives the planet's huge magnetic dynamo. This doesn't affect Earth's spin or geographical north, but it does cause the structure of the magnetic field to shift, which affects compasses. Although a lot of navigation nowadays is done using GPS systems, the Federal Aviation Administration wants to make sure that aviators can still find their way to a safe landing using magnetic compasses — and that's why it requires airports to revise their runway designations periodically to reflect the magnetic shift.
Shifting continents: Earth's continents are on the move as well, and over the course of millions of years, that has affected the course of evolution. "The continents are drifting at about the same rate that your fingernails are growing," Phil Plait, the astronomer who presides over the Bad Astronomy blog, told me. If you go back 180 million years or so, nearly all of Earth's land mass was united in one large continent called Pangea, which meant land-based organisms could spread far and wide. Since then, the continents have drifted apart, separating populations and leading to the rise of new species. The breakup of Pangea helps explain why kangaroos thrived in Australia but not America.
Uneven gravity: Just as Earth's magnetic field has its variations, so does Earth's gravitational field. Readings from the European Space Agency's GOCE satellite have plotted the subtle differences in our planet's mass distribution, on land and in the oceans. "You'd think gravity is the same everywhere, until you start delving really deep into it," said Alice Enevoldsen, planetarium supervisor at the Pacific Science Center in Seattle (and the blogger behind Alice's Astro Info). Variations in Earth's mass could help explain how ocean circulation works and lead to better climate prediction models.
Inconstant sun: Speaking of climate, the variations in solar irradiance play a significant role in the warming and cooling trends experienced on our planet as well as on others. Some suggest that the sun is a bigger factor than human industrial activity when it comes to global climate change. Most climate scientists say greenhouse-gas emissions have been playing a more significant role lately, but variations in the amount of solar radiation hitting the planet are definitely a factor as well. Last year, one study found that the amount of solar energy reaching Earth increased even though the sun was at the low point in its 11-year activity cycle. And just today, scientists reported that the solar energy levels were actually lower than previously thought.
Lengthening day: If it seems as if each day is longer than the last, you're right. But that's just because Earth is slowing down ever so slightly every day. Gravitational tugs from other celestial bodies (principally the moon and the sun) are causing the "great slowdown," as my colleague David Ropeik explained back in 2001. It's thought that when the moon formed, billions of years ago, a full day was six hours long, and that the day lasted less than 23 hours when dinosaurs ruled the earth. Nowadays, leap seconds are periodically added to keep atomic clocks in sync — most recently at the end of 2008.
Galactic tides: Our solar system's path through the Milky Way galaxy is subject to shifts as well. Scientists have noted that Earth's biodiversity seems to dip every 60 million years or so, at just about the time when the solar system bobs up through the average plane of the Milky Way's disk. Last month, researchers suggested that the rise through the galactic plane exposed the solar system to a surge of cosmic rays, dealing a damaging blow to life on Earth. Some scientists have also wondered whether the solar system's galactic oscillations might periodically send more comets into the solar system (killing off, let's say, the dinosaurs). This definitely sounds like a bad thing, and depending on who's doing the talking, we're either "very close" to the next risky period, or 10 million years away.
That puts this whole question over whether you're a Virgo or a Leo in perspective, doesn't it?
Update for 2:30 p.m. ET Jan. 15: I initially wrote that astrology is "totally divorced" from modern astronomy, but that's an overstatement. Astrologers still depend on accurate determinations of celestial bodies' positions in the sky, as seen from Earth. They incorporate astronomical advances as well, such as the discovery of additional dwarf planets. But the way they interpret that information is different from how astronomers would interpret it.
Take the constellations, for example: Some commenters have noted that when an astrologer says the sun is "in the house of Aries," that doesn't mean the sun is actually in the astronomical constellation of Aries. In astrology, the sun enters Aries at the time of the March equinox, as explained here by EarthSky. The sky is then divided into 12 houses (named after constellations) that take up equal amounts of angular distance around the celestial equator. Thus, the astrological signs do not correspond precisely with the astronomical constellations as they're defined today, and they never did.
In ancient times, the "first point of Aries" occurred when the sun was actually in the astronomical constellation of Aries. No more. Now the sun is in the constellation of Pisces for the March equinox, and by the time Earth wobbles its way to the year 2600 it will be in Aquarius for the start of northern spring. For astronomers, that will be the true dawning of the age of Aquarius, although some astrologers (and songwriters) argue that the Aquarian age has already begun.
Astrologers borrow quite a bit from astronomy, but generally speaking, the only professional interest that astronomers take in astrology is historical — since, as noted above, the roots of astronomy go back to ancient beliefs about the connections between the cosmos and our destinies. It's a natural human yearning. I'll bet that at least one or two young astronomers have checked their "love signs" at some point, even if they haven't written a research paper about it.
Tatooine's twin suns - coming to a planet near you...
Originally Posted by Montana Smith
So Virgo's no longer intacto?
Guess Mercury finally got his way...
Twin suns - setting on Earth any day now. Rumours of possible wamp rats and Sarlaac manifestation yet to be confirmed. May be set for 2012 appearance
IT'S the ultimate experience for Star Wars fans - staring forlornly off into the distance as twin suns sink into the horizon. Yet it's not just a figment of George Lucas's imagination - twin suns are real. And here's the big news - they could be coming to Earth.
Yes, any day now we see a second sun light up the sky, if only for a matter of weeks.
The infamous red super-giant star in Orion’s nebula - Betelgeuse - is predicted to go gangbusters and the impending super-nova may reach Earth before 2012, and when it does, all of our wildest Star Wars dreams will come true.
The second biggest star in the universe is losing mass, a typical indication that a gravitation collapse is occurring.
When that happens, we'll get our second sun, according to Dr Brad Carter, Senior Lecturer of Physics at the University of Southern Queensland.
“This old star is running out of fuel in its centre”, Dr Carter said.
“This fuel keeps Betelgeuse shining and supported. When this fuel runs out the star will literally collapse in upon itself and it will do so very quickly.”
When this happens a giant explosion will occur, tens of millions of times brighter than the sun.
The bad news is, it could also happen in a million years. But who's counting?
The important thing is, one day, night will become day for several weeks on Earth.
“This is the final hurrah for the star,” says Dr Carter.
“It goes bang, it explodes, it lights up - we’ll have incredible brightness for a brief period of time for a couple of weeks and then over the coming months it begins to fade and then eventually it will be very hard to see at all.”
The interwebs is being flooded with doomsday theories saying the impending supernova confirms the Mayan calendar’s prediction of the Armageddon in 2012.
These conspiracies aren’t helped by the word “Betelgeuse” being associated with the devil.
Though it is a derivation of the Arabic phrase “yad Al Jauza” meaning the “hand of Al-Jauza” referring to a mysterious woman that controls the order of the universe, it hasn’t stopped some people from clearing out their bunkers and stocking up on tinned food.
Far from being a sign of the apocalypse, according to Dr Carter the supernova will provide Earth with elements necessary for survival and continuity.
“When a star goes bang, the first we will observe of it is a rain of tiny particles called nuetrinos,” says Dr Carter.
“They will flood through the Earth and bizarrely enough, even though the supernova we see visually will light up the night sky, 99 per cent of the energy in the supernova is released in these particles that will come through our bodies and through the Earth with absolutely no harm whatsoever.”
Stars such as the supernova produce elements that are critical to life on Earth.
Quite literally, the whole of Earth and our solar system is made of star stuff, including most of the heavy elements of the Periodic Table.
“It literally makes things like gold, silver - all the heavy elements - even things like uranium….a star like Betelgeuse is instantly forming for us all sorts of heavy elements and atoms that our own Earth and our own bodies have from long past supernovi,” Dr carter said.
Some experts have speculated Betelgeuse’s explosion may cause a neutron star or result in the formation of a black hole approximately 1300 light years from Earth, but Dr Carter says it could go either way.
“There’s a reasonably even chance of a neutron star or a black hole”, he says.
“If it were me, I’d suspect it would more likely become a black hole at 20 solar masses.”
Addendum: NEWS.com.au would like to apologise for their error - as we all know, Betelgeuse is the second biggest star in the Orion constellation, not the universe
@JRJENNINGS86, you've sent my mind back to Psalms 19...The Heavens Declare the Glory of God and the Firmament Sheweth His handywork. Truly, that is one of the most fascinating text in all of Scripture in my humble opinion.
I love astronomy and the space exploration program. I can't wait to see what becomes of NASA's Project Orion.