Wednesday, November 7, 2012



The EarthDuring the day earth receives light from The Sun directly and at night the light of the sun is directed towards The Earth through The Moon.  Earth interacts with other objects in space, especially the Sun and the Moon. During one orbit around the sun, the Earth rotates about its own axis 366.26 times, creating 365.26 solar days, or one sidereal year. The Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane, producing seasonal variations on the planet's surface with a period of one tropical year (365.24 solar days).


The MoonWe see the Moon because of sunlight that is reflected by it.  It is the brightest object in the sky after the Sun, although its surface is actually very dark. The Moon's current orbital distance, about thirty times the diameter of the Earth, causes it to appear almost the same size in the sky as the Sun.


The Sun.   It  has “burned” for more than 4.5 billion years. It warms our planet every day and provides the light by which we see all the beautiful things around us. Sunlight is necessary for life on Earth.  The Sun is currently traveling through the Local Interstellar Cloud in the Local Bubble zone, within the inner rim of the Orion Arm of the Milky Way galaxy. The Sun orbits the center of the Milky Way at a distance of approximately 24000-26000 light-years from the galactic center, completing one clockwise orbit, as viewed from the galactic north pole, in about 225–250 million years.




  • The New moon is when the moon is all dark. None of the moon that we can see is lit up during the new moon.
  • Crescent moon is when the moon is between the new and quarter moon stages. It looks like a "C" shape.
  • The Quarter moon is when half of the moon is visible. If the moon is waxing, it is called the first quarter, if the moon is waning, it is the last quarter
  • Gibbous moon is between the quarter and full moon stages. More than half of the moon can be seen, but not all of it.
  • The Full moon is when the moon is all lit up. All of the moon that we can see is lit up by the Sun during the full moon.
  • A second full moon in one calendar month is usually called a blue moon. The saying "Once in a blue moon" refers to something that does not happen often - like a blue moon.




Constellations are named patterns of stars. All societies created them. The classical -- "ancient" -- constellations that populate our sky began in the lands of the middle east thousands of years ago, their origins largely lost to time. They passed through the hands of the ancient Greeks, who overlaid them with their legends and codified them in story and verse. During Roman times they were assigned Latin names. 

The 48 ancient constellations single out only the bright patterns. From around 1600 to 1800, post-Copernican astronomers invented hosts of "modern" constellations from the faint stars that lie between the classical figures, from pieces of ancient constellations, and from the stars that occupy the part of the southern sky that could not be seen from classical lands. Later astronomers broke the ship Argo into three parts, yielding 50 ancient constellations. 


Crux is the smallest of the 88 modern constellations, but is one of the most distinctive. Its name is Latin for cross, and it is dominated by a cross-shaped asterism that is commonly known as the Southern Cross. Southern cross can be seen as a brilliant cross in the southern sky and it show the South Pole.


The Big Dipper, also known as the Plough or the Saptarishi (after the seven rishis), is an asterism of seven stars that has been recognized as a distinct grouping in many cultures from time immemorial. Big Dipper is a group of seven bright stars that forms a pattern of a handle and a bowl. The component stars are the seven brightest of the formal constellation Ursa Major


Scorpion, sometimes known as Scorpio and Scorpius, is one of the constellations of the zodiac. Its name is Latin for scorpion, and its symbol is (Unicode). It lies between Libra to the west and Sagittarius to the east. It is a large constellation located in the southern hemisphere. Scorpion can be seen clearly with its head, long body, tail and stinger between June and August.


Orion sometimes subtitled The Hunter, is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous, and most recognizable constellations in the night sky.Its name refers to Orion, a hunter in Greek mythology. Orion can be seen clearly as a hunter with a belt and sword between December and February. You can see Orion the best in the winter.