The farthest northern latitude at which the sun can appear directly overhead, which occurs on the June solstice. North of this line is the subtropics and Northern Temperate Zone. The Tropic of Capricorn is at the opposite latitude south of the Equator. South of the Tropic of Cancer and north of the Tropic of Capricorn are the Tropics. The center line is called Equator.
Monday, May 25, 2009
Atomic clock is a special type clock that shows almost accurate time. Atomic clock maintains continuous and stable time scale. the first model of atomic clock was build on 1949 by the U.S National Bureau of standards. First successful atomic clock was designed on 1955 in UK by National physical laboratory. A chip scale atomic clock designed in august 2004 by NIST scientists. Chip type atomic clock consumes only 75 mw current. Major application of atomic clocks are to generate standard frequency and serve time signals to time signal sites. They also installed at navigation transmitters and broadcasting stations. By the help of this atomic clock signals broadcasting stations produces accurate carries frequency. GPS navigation systems base signals are also from atomic clock.
Sunday, May 24, 2009
Saturday, May 23, 2009
Thursday, May 21, 2009
Ida is a new fossil found in Germany that will help to created a good media attention and will likely continue to make waves among those who study human origins.
The paleontologist team that analyzed the 47-million-year-old fossil seen above, suggests Ida is a critical missing-link species in primate evolution. This fossil, reduces the gap between higher primates (monkeys, apes, and humans) and their more distant relatives such as lemurs.