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Introduction to Constellations

Introduction to Constellations

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Introduction to Constellations

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  1. Introduction to Constellations Backyard Astronomy

  2. The Night Sky People have watched the night skies for millions of years. Some just out of curiosity. Some out of boredom. Some looking for portents, either good or bad. However, the one thing that they all saw was that there was a pattern in the way the stars revolved around the heavens.

  3. The Night Sky You need only to look up for a few hours to begin to see these same patterns yourself. Like the Sun, stars rise in the east and set later in the west.

  4. What You Need for Stargazing You don’t really need anything, but some things are handy, like… Complete darkness-Don’t laugh, it’s not that easy to find. Rural area are slowly being urbanized, bringing their lights with them. Light pollution is a real problem.

  5. What You Need: Darkness Darkness means getting away from the city when you can. Stay away from any place that emits light in any way.

  6. What You Need: Darkness Darkness means keeping up with the phases of the moon, too. When the moon is waxing past half full, it’s quite hard to see.

  7. What You Need: Star Map/ Planesphere It is handy to have a star map to help get you oriented. Star Maps are also called planespheres.

  8. What You Need: Binoculars Binoculars don’t have to be very strong to give you a much better, brighter view of the stars. Binoculars have the ability to gather light even at low magnifications. Even 4X ones will make a marked difference in the detail you can see.

  9. What You Need: Telescope? No, you don’t need a telescope, though they are fun. Telescopes require a certain amount of sophistication to set up and operate and they are not for everybody. There are some nice models available at affordable costs. The optics are available alone also if you want to build your own.

  10. What You Need: Warm Clothes You’ll be happy to know that the best time to look at stars is the least popular time of year to be outside, the winter. So, dress warmly. Remember that the nights are longer in the winter.

  11. Leonid: An Aside I remember the 2002 Leonid meteor shower very well. The Leonid comes in November and that year it was really cold. I got up about 3:30 a.m. (yes, that’s right) to have a look. It was incredible. Meteors were streaking across the sky every few seconds. Sometimes several at once. It was the best Leonid for over 35 years. We sat on the deck in sleeping bags and drank coffee. It’s one of my happiest memories. Another Leonid of that magnitude is not expected again until 2098 or 2131.

  12. Finding Polaris and Why Polaris (or the North Star) is where you want to start. Because Polaris is aligned with the Earth’s axis of rotation, it remains fixed, with all the other planets and stars appearing to move around it.It is the one star that remains fixed at all times.

  13. Getting Oriented or Where the Hell is North? Yea, you have to find north. It’s where Polaris (or North Star) is.

  14. Figuring the Angle Once you’ve decided where north is (right ascension), face in that direction. Next you have to figure declination (up and down). Extend your arm and make a fist. Put the bottom of your fist on the horizon. The top of your fist is about 80 higher. Place your other fist on top of your first. You’ve now measured 160 up from the horizon. Polaris is located between 250 and 300 above the horizon. Polaris is faint, so look carefully!

  15. Another Way to Find Polaris If all that compass and angles are just too complicated, there is another way to find Polaris. Find the Big Dipper (not a constellation). The two stars that form the front of the cup of the dipper define a line pointing to Polaris.

  16. The Big Dipper

  17. The Stars Circling Polaris

  18. Now That You’re Oriented, It’s Time to Explore. You’re pointed in the right direction, but what now. Stars and constellations move constantly and seasonally. What am I looking for? What you need is a star map.

  19. A Few Constellations...

  20. Ursa Minor Once you’ve located Polaris, you’re ready to identify your first constellation. Polaris is the last star located in the handle of the asterism, the Little Dipper. The name of the constellation that contains the Little Dipper is Ursa Minor or Little Bear.

  21. Ursa Minor • Ursa Minor, also called the Little Dipper, is a circumpolar constellation. This means it never sets in the northern sky. The true figure represented by the stars is the Little Bear. • There are several mythological stories behind these famous constellations. In Greek myth, Zeus was having an affair with the lovely Callisto. When his wife, Hera, found out she changed Callisto into a bear. Zeus put the bear in the sky along with the Little Bear, which is Callisto's son, Arcas.

  22. Ursa Minor

  23. Ursa Major Ursa Major is probably the most famous constellation, with the exception of Orion. Also known as the Great Bear, it has a companion called Ursa Minor, or Little Bear. Everyone living in the Northern Hemisphere has probably spotted the easily recognized portion of this huge constellation. The body and tail of the bear make up what is known as the Big Dipper. Several different cultures saw a big bear in the sky. The ancient Greeks had a few different stories to explain how the animal ended up there. In one story, Hera discovered Zeus was having an affair with Callisto and turned her into a bear. Zeus put her in the sky along with her son, Arcas, who became the Little Bear.

  24. Ursa Major

  25. Draco • Draco the dragon, is only present in the Northern Hemisphere, so those living in the Southern Hemisphere will never see this long constellation. • The easiest way to spot Draco is by finding his head. It consists of four stars in a trapezoid, burning brightly just north of Hercules. From there, the tail slithers through the sky, eventually ending between the Big and Little Dippers. It can be difficult to trace Draco in the night sky. From the head, follow the body north towards Cepheus. It suddenly shifts south and west, ending up between the two dippers. The end of the constellation is held by Thuban, which was the pole star over 4,000 years ago.

  26. Draco

  27. Orion’s Belt 27

  28. Signs of the Zodiac Common Constellations

  29. Aquarius: The Water Bearer In Greek mythology Aquarius was Ganymede, "cup-bearer to the gods". Alpha Aquarii ("Sadalmelik") and beta Aquarii ("Sadalsuud") are twin supergiants with nearly identical names. The names mean, respectively, "The Lucky One of the King" and "The Luckiest of the Lucky". Gamma Aquarii shares in the good fortune: "Sadachbia": "The Lucky Star of Hidden Things" Incidentally, if the "Age of Aquarius" was celebrated in the 1960s, the real event is still some 600 years off: at that time Aquarius will contain the vernal equinox, marking the return of the Sun into the northern celestial hemisphere.

  30. Aquarius: The Water Bearer

  31. Aries: the Ram Aries, "The Ram", is an ancient constellation which was of considerable importance since the sun passed through it at the vernal equinox. • This point has now moved into Pisces, but the vernal equinox is still known as the First Point of Aries. In another six hundred years the point will have moved into Aquarius. The Ram in question may have been the one whose golden fleece was the object of Jason's quest. There is some reason to believe that the Greeks just took over a much older horned animal at this time of the year; the horn being a symbol for fecundity, renewal, and so on. As the Sun came into this constellation, at the vernal equinox, the year itself was being renewed.

  32. Aries: the Ram

  33. Cancer The Crab The name comes from the Latin; cancer means crab. The crab in question is the one sent by Hydra to attack Heracles. It was only a bit part, but one which secured its immortality.

  34. Cancer

  35. Gemini The Twins Gemini, the Twins, are really only half-brothers. They share the same mother (Leda) but have different fathers. Castor's father was a king of Sparta, Tyndareus - who would be chased from his throne but later rescued by Heracles (who nevertheless wound up killing him). The father of Pollux was none other than Zeus, or Jupiter. Zeus visited Leda on her wedding night in the guise of a swan. Thus the twins would be born. (In fact two twins came from this double union, but let's not complicate the matter even more...)

  36. Gemini

  37. Leo: The Lion The first on the list of Heracles' labors was the task of killing the Nemean Lion, a giant beast that roamed the hills and the streets of the Peloponnesian villages, devouring whomever it met. The animal's skin was impervious to iron, bronze, and stone. Heracles' arrows harmlessly bounced off the lion; his sword bent in two; his wooden club smashed to pieces. So Heracles wrestled with the beast, finally choking it to death. He then wrapped the lion's pelt about him; it would protect him from the next labor: killing the poisonous Hydra.

  38. Leo

  39. Libra: The Scales Libra means "The Scales" or "Balance", so named because when the zodiac was still in its infancy, some four thousand years ago, the sun passed through this constellation at the autumnal equinox (21 September). At the two equinoxes (Spring and Autumn) the hours of daylight and darkness are equal. As a symbol for equality, the constellation came to represent Justice in several middle Eastern cultures. However, the Greeks had a different perspective; at one time Scorpius, which lies just to the east, was much larger, and the stars that make up Libra were then known as the Claws of the Scorpion.

  40. Libra

  41. Pisces: The Fish Pisces is an ancient constellation derived, some say, from the story of the terrible Greek god Typhon. (This is not the Chinese word for "big wind", which - in English - is of course spelled "typhoon". The French, however, spell this word "typhon", which adds to the confusion. It is possible that the Chinese borrowed the word from the Greek. The modern Greek equivalent is spelled "tau upsilon phi omega nu" and means "cyclone".)

  42. Pisces

  43. Sagittarius It was the Romans who named the constellation Sagittarius ("sagitta" is Latin for `arrow'), although several stars carry Arabic names which identify just which portion of the constellation they represent.Sagittarius has a muddled history. In ancient times the asterism of three bright stars in a curved line was seen as a bow to some, leading both Greek and Roman writers to confuse the constellation with Centaurus.

  44. Sagittarius

  45. Scorpius: The Scorpion As mentioned regarding Orion, Gaia may have sent the scorpion to kill the mighty hunter, as he had vowed to rid the earth of all wild animals. Or Apollo might have told Gaia of Orion's boast, fearful that Orion had designs on Apollo's sister Artemis. In any case it was Gaia who sent the scorpion to kill Orion. Later the animal would chase Orion across the heavens, but it could never catch him, for the scorpion was so placed that it would rise in the east only after Orion had safely disappeared over the western horizon.

  46. Scorpius

  47. Taurus: The Bull Is Taurus attacking Orion, the Hunter, or are the Horns of the Bull the real story? The horn was a symbol of fertility and bountiful riches in many cultures for thousands of years, and it is probably the case here, for the constellation would have announced the Vernal Equinox at around 4000 BC.

  48. Taurus

  49. Virgo: The Virgin Virgo is the second largest constellation (after Hydra). As a member of the Zodiac, Virgo has a number of ancient myths and tales. The Sun passes through Virgo in mid-September, and is therefore the constellation that announces the harvest. Virgo is often represented as a "maiden" (as its name indicates). In antiquity, she may have been Isis, the Egyptian protectress of the living and the dead and the principal mother goddess.

  50. Virgo