Яндекс.Метрика

Thursday, June 26, 2014

Sun's position in the Zodiac

TRADITIONAL
ASTROLOGICAL DATES
ACTUAL ASTRONOMICAL DATES
TODAY (c. 2000 C.E.)
ConstellationDate SpanDaysConstellationDate SpanDays
Aries21 Mar - 19 Apr30Aries19 Apr - 13 May25
Taurus20 Apr - 20 May31Taurus14 May - 19 Jun37
Gemini21 May - 20 Jun31Gemini20 Jun - 20 Jul31
Cancer21 Jun - 22 Jul32Cancer21 Jul - 9 Aug20
Leo23 Jul - 22 Aug31Leo10 Aug - 15 Sep37
Virgo23 Aug - 22 Sep31Virgo16 Sep - 30 Oct45
Libra23 Sep - 22 Oct30Libra31 Oct - 22 Nov23
Scorpio23 Oct - 21 Nov30Scorpius23 Nov - 29 Nov7
   Ophiuchus30 Nov - 17 Dec18
Sagittarius22 Nov - 21 Dec30Sagittarius18 Dec - 18 Jan32
Capricorn22 Dec - 19 Jan29Capricornus19 Jan - 15 Feb28
Aquarius20 Jan - 18 Feb30Aquarius16 Feb - 3/1124-25
Pisces19 Feb - 20 Mar30-31Pisces12 Mar - 18 Apr38

Milky Way

Wednesday, June 25, 2014

Today Questions

Today we will start our class with discussion of following questions: http://cwx.prenhall.com/bookbind/pubbooks/chaisson4/chapter10/multiple2/deluxe-content.html

Orbital Mechanics Examples

Orbital Mechanics

Parallax Examples

Parallax Examples #Parallax #Astronomy #Math #Equations #education #AST110 #BMCC #GeneralAstronomy

Parallax


Monday, June 16, 2014

Friday, June 13, 2014

The apparent annual path of the sun upon the celestial sphere is called the ...

1) The apparent annual path of the sun upon the celestial sphere is called the ...  
a) ecliptic;   b) planet;   c) star;   d) galaxy;    e) constellation.

2) One of eight major bodies that orbit the Sun, visible to us by reflected sunlight.  
a) ecliptic;   b) planet;   c) star;   d) galaxy;    e) constellation.

3) A glowing ball of gas held together by its own gravity and powered by nuclear fusion in its core.  
a) ecliptic;   b) planet;   c) star;   d) galaxy;    e) constellation.

4) Gravitationally bound collection of large number of stars.  
a) ecliptic;   b) planet;   c) star;   d) galaxy;    e) constellation.

5) The totally of all space, time, matter, and energy:  
a) universe;   b) astronomy;    c) celestial sphere;    d) constellation;    e) galaxy.  

6) Branch of science dedicated to the study of everything in the universe that lies above Earth's atmosphere:  
a) universe;   b) astronomy;    c) celestial sphere;    d) constellation;    e) galaxy.    

7) A human grouping of stars in the night sky into a recognizable pattern:  
a) universe;   b) astronomy;    c) celestial sphere;    d) constellation;    e) galaxy.   

8) An imaginary sphere surrounding Earth  to which all objects in the sky were once considered to be attached:  
a) universe;   b) astronomy;    c) celestial sphere;    d) constellation;    e) galaxy. 

Tuesday, June 3, 2014

Lab 1. Page 1-5. Celestial Identification






Conversion Factors


General Astronomy

General Astronomy AST100 #GeneralAstronomy #AST100 #Astronomy https://twitter.com/GenAstronomy
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12-inch Ruler, Protractor

Each Student is require to supply their own 
1) a 12-inch ruler that includes metric units (centimeters) in addition to inches
and
2) a p
rotractor for measuring angles.

Lecture 1. Videos

0. Charting the Heavens. Homework Problems.


What is a Constellation?

What is a Constellation?

WHAT IS A CONSTELLATION?

WHAT IS A CONSTELLATION? http://www.videojug.com/film/what-is-a-constellation What Is a Constellation? When you go outside on a dark clear night, look up into the night sky and see hundreds if not thousands of stars randomly spread across the sky - how do you tell one from another? The answer is you learn the constellations. The constellations are totally imaginary things that poets, farmers and astronomers have made up over the past 6,000 years (and probably even more!). The real purpose for the constellations is to help us tell which stars are which, nothing more. On a really dark night, you can see about 1000 to 1500 stars. Trying to tell which is which is hard. If you were shown a map of the world then you would easily recognise the continents and countries and would be able to pick out cities and towns. Well let's split the sky into continents, countries and cities. The constellations help by breaking up the sky into more manageable bits. For example, if you spot three bright stars in a row in the winter evening, you might realize, "That's part of Orion!" Suddenly, the rest of the constellation falls into place and you can declare: "There's Betelgeuse in Orion's left shoulder and Rigel is his foot." And once you recognize Orion, you can remember that Orion's Hunting Dogs are always nearby. Then you might recognize the two bright stars in the upper and lower left of the photograph as Procyon in Canis Minor and Sirius in Canis Major. The constellations change throughout the year. In winter and early spring we have Orion dominating the sky. His arch enemy Scorpio is high in the southern sky during the summer months. From the northern hemisphere Ursa Major or the great bear never disappears beneath the horizon. We have now broken it down into ‘the plough', ‘the chariot' or in the USA ‘the big dipper'. Follow the two stars at the end of the plough, known as the pointers and they point to the North Star. Follow them downwards and they point to Leo the lion. Using one constellation helps us find many more constellations. Let's go back to Orion. Follow the stars in the belt up past the star Betelgeuse in his left shoulder and we come across Castor and Pollux the two bright stars in Gemini the twins. Follow his belt in a line upwards and we find Aldebran, the eye of Taurus the Bull. There are 88 recognisable constellations in the sky. Some take a little more imagination than others to see them. The W shape of Cassiopeia, a beautiful lady sitting in a chair needs a lot of imagination. What about Pegasus, the winged horse, and Perseus ,the prince, all once famous names from mythology. Perhaps we spend too much time in front of a television to really let our minds run astray!

Sunday, June 1, 2014

ALL ABOUT MARS

http://www.videojug.com/film/all-about-mars

ALL ABOUT MARS
Named after the Roman God of war, and sitting between Earth and Jupiter, Mars is an interesting planet. VideoJug provides you with lots on information on this intriguing planet Mars.
Mars, the red planet was so called after the Roman god of war.

Mars is the fourth planet out from the Sun. It sits between Earth and Jupiter. Between 206 and 250 million km from the Sun.

It is a small world about half the size of Earth.

1 year on Mars lasts just less than 2 Earth years and a day lasts for about the same length as on earth, just over 24hrs.

Mars has a very thin atmosphere made mainly of carbon dioxide.

It suffers from very high winds that can blow up huge sandstorms which cover the whole planet.

At the North and South poles there are ice caps of frozen carbon dioxide.

These ice caps grow and shrink throughout the Martian year. Mars has seasons, but they lasts for 6 months each.

The temperature on the surface varies from -140? in winter, to a very pleasant 20? during the Summer.

Since the late 19th and early 20th century it was believed that there would be life on Mars and that a Martian invasion was imminent. This belief came about through a translation error by the Italian astronomer Giovanni Schiaparelli during the opposition of 1877 when Mars was at its closest to Earth.

The best telescope views of Mars at the time appeared to show areas of vegetation, and Schiaparelli claimed to have seen 'canali' crisscrossing the surface. This canali was translated into English not as 'channels' but as 'canals'. And so the Martian canals were born.

But unfortunately since 1964 many probes have visited Mars and it has been found to be a very dry inhospitable place.

In 1975, NASA's Viking lander sent back the first real pictures of the surface.

Since 1975 Mars has been almost continually visited by probes. These probes tend to land on the surface first by using parachutes to slow them down and then by inflating balloons so that they can bounce to a standstill.

In 2003, NASA launched two remote controlled rovers called Spirit and Opportunity. These rovers have been busily exploring the surface and sending back masses of information.

The surface of Mars is coloured red. This is due to iron oxide (commonly known as rust) covering the surface. It has the consistency of talcum powder.

It is this dust that blows around during the sandstorms. 'Dust devils' have been seen blowing across the Martian surface.

There are giant dormant volcanoes. The largest mountain in the solar system belongs to Olympus Mons all 26km high. Mount Everest is not quite 9km high.

Mars has two tiny ‘potato shaped' Moons, Phobos and Deimos. Phobos is 27km long while Deimos is only about 15km.

Phobos goes around Mars in just over 11 hours while Deimos takes 2½ days.

Because Phobos is so close to Mars, it is gradually getting closer and in about 5 million years it will crash into the surface.

Scientists hope to be sending manned missions to Mars after recent satellite images showed traces of recent water flows.

In 1997, a meteorite that had come from Mars was found in the Antarctic ice on Earth. Under microscopic examination, what appeared to be tiny worms were discovered inside the rock.

Could these be fossilized Martians?

So, still Mars remains a mystery.



HOW DOES A TELESCOPE WORK?

http://www.videojug.com/film/how-does-a-telescope-work HOW DOES A TELESCOPE WORK?
VideoJug presents a great guide to the incredible invention that is the telescope. The telescope allow us to look into outer space and see the planets and stars so clearly that they seem close enough to touch. But how did telescopes evolve and how do they work? We reveal all you need to know about telescopes.
Telescopes are an incredible invention. They allow us to look into outer space and see the planets and stars so clearly that they seem close enough to touch. But how did they evolve?

The first telescope was invented in 1608 by a Dutch eyeglass maker named Hans Lippershey. However, it wasn't until 1610 that the Italian astronomer Galileo Galilei (1564-1642), first used one to look into space.

Though Galileo's first attempts at building a telescope were very crude, he was able to see craters and mountains on the Moon and also Jupiter's four largest moons circling the planet.

Telescopes remained very much the same until 1671 when the British scientist Sir Isaac Newton (1642-1727) realised that a mirror could be used instead of a lens to collect the light.

In 1672 a French science teacher Laurent Cassegrain improved upon Newton's design.

Galileo's telescope was what is known as a refracting telescope.

Newton's telescope is called a reflecting telescope.

And Cassegrain gave his name to the Cassegrain telescope.

So how does a Telescope work?

A refracting telescope is a long tube with a convex lens at one end and an eyepiece at the other. Light comes in through the convex lens and is condensed or refracted toward the eyepiece. There the image is magnified.

A reflecting telescope uses a curved or concave primary mirror at the rear of the telescope. Light is collected by the mirror and is reflected back up the telescope tube until it reaches a secondary mirror set at a 45º angle. The image is then reflected out through the side of the telescope where it passes through a concave lens or eyepiece.

Cassegrain's telescope is similar to Newton's but it uses a convex mirror to reflect the image back down the tube to come out through a hole in the centre of the primary mirror, where it is received in the eyepiece.

The benefit of Newton's and Cassegrain's telescope compared to Galilieo's is that mirrors can be made much larger than the lenses in Galileo's design, and so, much larger telescopes can be built.

The largest refracting telescope in the world is the Yerkes telescope near Chicago USA. It has a lens 40 inches in diameter. Another of the largest is the Mount Palomar telescope in the USA uses Newton's reflecting design. It has a mirror which measures 5 metres or 200 inches in diameter!

The Keck telescope in Hawaii uses an array of 36 mirrors that combine to measure 10 metres across.

You must NEVER look at the Sun through a telescope, doing this would cause irreparable damage to your eyes.

Telescopes make a distant object look larger but they also magnify the light making faint objects seem much brighter.

Through a telescope the famous Orion nebular can be seen in great detail. And the Andromeda galaxy is a sight to behold.

In 1991 NASA launched the Hubble space telescope into orbit around the Earth. It is a reflecting telescope with a primary mirror of 2.4metres ( or 94inches) in diameter. Because it is above the Earth's atmosphere it has given us unprecedented images of deep space objects.

But visible light is only a small part of the spectrum. Objects can also emit radio waves and for these we have Radio Telescopes.

Radio telescopes have a giant dish which catches and reflects the radio signal to a receiver placed at the focal point.

One of the largest radio telescopes is situated at Jodrell Bank in Northern England. It was established in 1945 by Sir Bernard Lovell.

So whether you're all at sea or high in the sky, there is always something to see with a telescope.


HOW BIG IS THE GALAXY?

http://www.videojug.com/film/how-big-is-the-galaxy
Here is a short video all about galaxies. Our Galaxy is named the Milky Way and it is such a big galaxy that we cannot measure it in miles or kilometers, as the numbers would be mind boggling. So here is a short guide to galaxies, which come in many shapes and sizes and contain billions of stars. All the stars in the universe are not scattered around randomly but instead are grouped together in clusters called Galaxies. Galaxies come in many shapes and sizes and contain billions of stars. It is said that there are more stars in the universe than there are grains of sand on every beach in the world. Our Solar system of the Sun and planets live in a galaxy very similar to this one. We are placed about three quarters of the way out from the center of our Galaxy. We call our galaxy the Milky Way. On a very dark night the Milky Way can be seen stretching across the sky. So, how big is it? It is so big that we cannot measure it in miles or kilometers, the numbers would be mind boggling. Instead we must use another measurement called a light year. What is a light year? If you switch a light on, the light leaves its source and arrives at your eyes instantaneously. Now if you stood 186 thousand miles away or about 2 thirds the distance to the Moon and the light was switched on it would take 1 second for the light to reach you. Are you good at Mathematics? Right, well multiply 186 thousand by 60 seconds. That comes to 11 million miles. If you stood this far away it would now take 1 minute for the light to reach you. Multiply this by 60 minutes and it would now take 1 hour for the light to reach you. Multiply this by 24 hours and it now takes 1 whole day to reach you. Over 160 Billion miles. Now the hard bit, multiply this number by 365, the number of days in a year and this massive number is, 1 light year. Our Galaxy is 100 thousand light years across. A ridiculous number to try to understand. Let's put it another way if you travelled at 186 thousand miles per second it would take you 100 thousand years to get from one edge to the other. Okay, still too big a number. Let's try and make it more understandable. If the Sun was a ball 1 meter across then the Earth would be a garden pea over 100 meters away. And Pluto would be a grain of rice 4 km or one light day from the Sun. On this scale, the nearest star Alpha Centuri which is 4 light years away or 26 Trillion miles would be on the Moon. There are only seven stars less than 10 light years from Earth. The nearest Galaxy to ours is called the Andromeda galaxy it is an incredible 2.2 million light years away. That means we are seeing it as it was 2.2 million years ago. So without Captain Kirk and his star ship's warp speed it looks like we'll be staying close to home for a long time to come.

ALL ABOUT URANUS

ALL ABOUT URANUS
http://www.videojug.com/film/all-about-uranus
The first planet to have been discovered in recent times, the planet Uranus, named after the Greek god of the sky, is the third largest planet in our solar system. Uranus is an extremely interesting planet, so VideoJug presents you with many Uranus facts in this short film. Uranus is the third largest planet in the solar system. It is 3 billion km from the Sun lying between Saturn and Neptune. It is named after the Greek God of the sky. Uranus was the first Planet to be discovered in modern times. Although it is just possible to see Uranus with the naked eye under ideal circumstances, it was the musician and mathematician Sir William Herschel who formally identified Uranus In March 1781. Uranus is a giant gas planet. It is 51200km in diameter, but is made of 83% hydrogen and 15% helium. The strange thing about Uranus is that it is tilted over on one side to 98º. This means that Uranus rolls around the Sun on its side. For one half of a Uranus' year, about 42 years, the ‘North' of Uranus is facing the sun and is in constant sunlight while the ‘South' is in darkness. Then for next 42 years the situation is reversed and the ‘Southern' hemisphere gets all the light. Uranus has a faint ring system, also discovered by Herschel. It has over 27 satellites, most of them not much bigger than large rocks, but 5 of them have been given names taken from Shakespeare. Uranus has only ever been visited once by a space craft, NASA's Voyager 2 flew past in 1986. There are currently no plans to visit Uranus in the near future.

ALL ABOUT SATURN

http://www.videojug.com/film/all-about-saturn

ALL ABOUT SATURN
Saturn, renowned for it's moons and rings, is the second largest planet in our solar system. VideoJug presents this short video describing planet Saturn in detail, with lots of interesting facts about this gaseous planet Saturn.
Of all the planets in the solar system, Saturn is surely the most stunning.

Saturn was named after the Roman God Saturnus or in Greek, Kronus father of Zeus. Saturn is the second largest planet in the solar system, only Jupiter is bigger.

Saturn is the 6th planet from the Sun. It lies between Jupiter and Uranus. It spins very quickly, one day on Saturn lasts for just over 10 hours.

Like Jupiter, Saturn is a gas giant made of mainly hydrogen, with a tiny rocky core. Very high winds cause bands to be seen in the tops of the clouds. But the most startling thing about Saturn is obviously its beautiful ring system.

The rings were first observed by the Italian astronomer Galileo in 1610. But he could not grasp the idea of a ring system; he thought that Saturn was actually 3 planets.

It was not until 1655 that the Dutch astronomer, Christiaan Huygens, first recognised a ring system.

The rings stretch from 6,600km to over 120,000km above Saturn's equator. But on average the rings are less than 1km in thickness.

The rings are made from billions of tiny particles of silica rock, iron oxide and ice particles ranging in size from specks of dust to the size of a small car. They are probably the result of a small moon that broke up near to Saturn.

There are gaps in the rings, the largest of which can be seen by Earth's telescopes, the Cassini division. Strange unexplained ‘spokes' have been seen in the rings.

Saturn takes almost 30 Earth years to make one orbit around the Sun, and as it does so, our view of the ring alters. From being wide open. To seeing them edge on.

Saturn was first visited in 1979 by the Pioneer 11 space probe on its grand our of the solar system.

In 1980 and 1981 it was visited by Voyagers 1 and 2. These two probes sent back the first really detailed images of Saturn.

Then in 2004 the Cassini-Huygens probe went into orbit around Saturn.

It has toured some of Saturn's 57 Moons. The largest of which - Titan - is the only moon in the solar system to have a dense atmosphere.

Almost all of Saturn's moons are named after Greek titans.

Lord of the rings you might say.



WHAT IS AN ECLIPSE?


WHAT IS AN ECLIPSE? If you've ever wondered exactly what an eclipse is, then this film answers all your questions. Watch VideoJug's simple guide to our solar system to find out. The Moon goes around the Earth every 28 days and as it does we see the different phases of the Moon. Occasionally the Moon, when it is between us and the Sun in the new Moon stage is perfectly in line with the Sun as seen from Earth and for a short period it covers and blanks out the Sun causing a Solar Eclipse. As luck would have it the Moon and the Sun appear as almost exactly the same size as each other in the sky. It is because of this small scale that the shadow which the Moon casts onto the Earth is very small indeed and only people standing on this narrow band get to see a Total Eclipse. Anybody standing outside of this band would get to see only part of the Sun obscured by the Moon; this is known as a partial eclipse. On occasions the Moon appears slightly smaller than the Sun leaving a ring of the Sun still showing all around the Moon, this type of eclipse is known as an annular eclipse. During an eclipse as the Moon creeps across the Sun's disc it gradually gets darker and darker on Earth. Animals and birds react as though it is night fall and return to roost. The temperature drops dramatically and the stars appear. The Moon's shadow can be seen racing across the face of the Earth from the West to the East. You must never look directly at the Sun as this can cause damage to your eyes; instead use a telescope or binoculars to cast an image of the sun onto white paper held behind, but never look through the telescope or binoculars at the Sun. As totality nears, less and less of the Sun can be seen until just a tiny part of the Sun can be seen peeping from behind the Moon giving, what Astronomers call the Diamond ring effect, basically because it looks like a diamond ring! Then for a few short minutes the Sun is completely blacked out by the Moon and the Sun's atmosphere or Corona can be seen glowing all around the Eclipsed Sun. Slowly the Moon then moves away from the Sun and narrow shafts of sunlight can be seen shining through the mountains and valleys at the edge of the Moon, these beads of light are known as Bailey's beads. An Eclipse of the Moon can also occur. Lunar eclipses happen at full Moon when the Moon is on the opposite side of the Earth to the Sun and it passes through the Earth's shadow. Unlike Solar Eclipses, anybody who is on the night time side of Earth and are able to see the Moon will be able to see a Lunar eclipse. Lunar eclipses are quite safe to look at too. During a Lunar eclipse, the Moon doesn't completely disappear but instead goes very deep red in colour. This is due to some of the Sun's light refracting through our atmosphere and shining a red light onto the Moon. As the Earth's shadow creeps across the Moon the curve of the Earth can quite clearly be seen. Because the Earth is bigger than the Moon, we cast a larger shadow than the Moon does and so Lunar Eclipses last longer than solar eclipses. Also, the entire Moon is covered by our shadow not just a narrow band as in Solar eclipses. So why don't we have an eclipse at every new Moon and every full Moon? Well we would if it wasn't for the Moon being on a slight tilt in its orbit and for the fact that it usually passes either above or below the Sun and above or below the Earth's shadow. In ancient times eclipses were treated with dread and fear, people thought that a giant dragon was eating up the Sun and they would bang drums and make lots of noise to chase the dragon away, which of course always worked! For more intriguing information about our solar system, check out our other films on the VideoJug website.

ALL ABOUT JUPITER





ALL ABOUT JUPITER

VideoJug provides you with information on the biggest planet in our solar system - Jupiter. All you need to know on Jupiter can be found on this video - so sit back and relax as we take you on a journey to visit Jupiter in outer space.
Jupiter is the largest of all the planets. It is so big it could swallow all the other planets together. It is almost 143,000km across at the equator.

If Jupiter were any bigger it would turn into a star!

Jupiter was named by the Romans as lord of the planets. In Greece this is the equivalent to Zeus, and was the original namesake of the weekday that would come to be known in English as Thursday.

Jupiter is the 5th planet out from the Sun. It lies between Mars and Saturn, at nearly 780 million km. It takes almost 12 Earth years to make one complete orbit.

Jupiter is not a solid rocky planet like the Earth, but instead is a 'gas giant' composed mainly of hydrogen and helium gas.

The pressure towards the centre has made the gases turn almost solid, but not rock.

What we see of Jupiter is simply the top of the clouds. Different layers combine to make belts crossing the surface.

Despite its massive size, Jupiter rotates very quickly; one day on Jupiter lasts for about 10 hours.

This rapid spinning has caused the planet to bulge at the equator, so that the radius at the equator is 72,000km while at the poles it is only 67,000km. This flattened shape is clearly visible from Earth.

Jupiter is a very turbulent place, high winds blow in every direction stirring up the cloud belts.

This stirring causes anomalies in the upper clouds. One such anomaly has created an anticyclone storm that has lasted for over 300 years. We call it 'The Great Red Spot'.

The great red spot is over 10 times bigger than the Earth. It was probably first observed by Giovanni Cassini, who described it around 1665.

It was Galileo who first turned a telescope toward Jupiter, and on January 7, 1610 he observed 4 bright spots moving around the planet over a succession of nights.

He deduced that these were in fact Moons orbiting around the planet. His discovery caused a major outcry with the church when he declared that the Earth was not the centre of the universe, but instead was a planet travelling around the Sun.

He was subsequently placed under house arrest for the rest of his life for heresy.

We now know that what Galileo saw were the four largest moons of Jupiter : Ganymede, Callisto, Io and Europa. Jupiter has at least 60 moons and counting.

The four Galilean moons are huge and are all completely different from each other in structure.

Ganymede is the largest of the Moons at over 5262km in diameter. It is composed of silicate rock and water ice, with an ice crust floating over a warmer ice mantle.

Callisto is the second largest at 4820km in diameter. Callisto is also the least dense of the Galilean moons.

It is one of the most heavily cratered satellites in the solar system, and has one major feature, a basin around 3000 km wide called Valhalla, which probably dates back to the formation of Callisto's crust.

Io is the closest of the four moons to Jupiter and the second smallest. But Io is still the fourth largest moon in the solar system and it is also the most volcanically active body in the solar system, with the largest recorded volcanic eruptions.

It is believed that if life exists in the solar system other than on Earth then Europa is the most likely candidate.

Europa is a strange world. It is completely covered in a layer of ice up to 100km thick, with possibly a liquid ocean beneath.

The core of Europa is keeping the ocean from melting and so there may be underwater volcanic geysers similar to those under the Earth's oceans.

Over millions of years, Jupiter's size has protected the Earth and the other inner planets from catastrophic impacts from comets and meteors by acting as the solar systems cosmic vacuum cleaner.

As it travels around in its orbit it sweeps all interstellar debris before it.

Proof of this occurred in 1994 when a comet known as Shoemaker-Levy 9 got a little careless near to Jupiter. (This was the 9th Com

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