<P> The first evidence of helium was observed on August 18 , 1868 , as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun . The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur , India . This line was initially assumed to be sodium . On October 20 of the same year , English astronomer Norman Lockyer observed a yellow line in the solar spectrum , which he named the D Fraunhofer line because it was near the known D and D lines of sodium . He concluded that it was caused by an element in the Sun unknown on Earth . Lockyer and English chemist Edward Frankland named the element with the Greek word for the Sun , ἥλιος ( helios ) . </P>
<P> The first evidence of helium was observed on August 18 , 1868 , as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun . The line was detected by French astronomer Jules Janssen during a total solar eclipse in Guntur , India . This line was initially assumed to be sodium . On October 20 of the same year , English astronomer Norman Lockyer observed a yellow line in the solar spectrum , which he named the D Fraunhofer line because it was near the known D and D lines of sodium . He concluded that it was caused by an element in the Sun unknown on Earth . Lockyer and English chemist Edward Frankland named the element with the Greek word for the Sun , ἥλιος ( helios ) . </P>
which noble gas was the first observed in india during a solar eclipse
which noble gas was the first observed in india during a solar eclipse
helium
helium