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Thursday, July 23, 2009

Nepal YMRC

solar eclipse:

A glimpse of the solar eclipse seen from Kathmandu around...


Tuesday, July 21, 2009

Students viewing of solar eclipse:



that will take place Wednesday morning by using special goggles, in Kathmandu, Nepal, 21 July 2009. nepalnews.com/NPA

About the Eclipse:

General information

On the Morning of July 22, 2009 there will be a total eclipse of the sun which will be visible from certain areas of Nepal.
A total eclipse of sun takes place when the moon passes between the sun and the earth and its shadow is cast onto the earth's surface
Along a narrow track across the planet, the sun is completely obscured - the eclipse is total. Outside the path of the totality, there is a broad area where the sun is partially covered or eclipsed.
Total eclipses of the sun are spectacular and awe inspiring. For those within the path of the totality, there are dramatic effects as the moon's shadow races across the earth's surface
Just before the sun disappears behind the moon, it shines through valleys on the moon's rim to create an effect which has been likened to a diamond ring. It then becomes quite dark and the sun's corona, which is normally hidden by the sun's glare, shines forth in a scene of great beauty. Even areas outside the path of the totality of will see the moon's shadow eating up a large part of the sun and it will become noticeably darker.

Astronomers find eclipses...

Why do astronomers find eclipses so fascinating?

While telescopes can be adapted to partly simulate an eclipse, a real eclipse offers the best visibility for observing the corona. At eclipse we see the corona as a crown of light around the sun; its shape is sometimes more round, sometimes more elliptical. We see its glow extending a million miles from the edge of the sun. The corona is composed of the same gases as the rest of the sun: 90 percent hydrogen, almost 10 percent helium, and a tiny quantity of the other elements. The corona flows outward into the solar system as the solar wind_streams of charged particles. These travel 93 million miles to earth and even pass beyond the outer planets.

Eclipses are a time-tested tool of solar astronomy. Observers pursuing the 1868 eclipse determined through spectroscopy the existence of the gas helium, from helios, the Greek word for the sun; only later was it found on earth. Other eclipses showed over time that the corona changes shape in step with the 11 year sunspot cycle.

Monday, July 20, 2009

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