David’s presentation starts with an overview of the basics types of spectrums.

He will show you how to build a simple solar spectroscope that shows that the Sun’s photosphere is composed of hydrogen, sodium and magnesium. A moderate resolution spectrum of the Moon and planets are analyzed next.

Moving father from Earth an introduction to spectral classification is covered with examples of standard spectral type stars taken with a simple grating filter. Also, the spectrum of stars is compared to a nebula spectrum.

Finally an image like the one on the right will be analyzed showing unique objects such a very cool temperature infrared star and the redshift spectrum of a Quasar that is 3.269 billion light years away

David Haworth enjoys astronomy, astrophotography and processing images to bring out details that cannot be seen by visual observing. David started in astrophotography in 1996 and he has used a variety of cameras to image the sky.

David wrote "Afocal Photography with Digital Cameras" chapter in the second edition of "The Art and Science of CCD Astronomy" book and "Flat Field Calibration using an LCD Monitor" article in AstroPhoto Insight magazine. David's images have appeared on a magazine front cover, in magazine articles, a book front cover, in books, in catalogs, in videos, on posters, on music CD covers, on T-shirts, on wine bottles and on a variety of web sites.

Recently, David has been using spectroscopes to analyze the light from celestial objects that range from the Sun to distant Quasars that are billions of light years from us.

More information available at http://www.stargazing.net/david/spectroscopy/index.html