Shows that I have presented outside of Montgomery College's
- Considering the Interactions: Bach, Escher,
Gödel, and Heisenberg a talk given at CF101 at noon on
Wednesday, January 25, 2012.
- Fusion Power on the Earth Using
Helium 3 from Somewhere in the Solar System, my newest traveling
PowerPoint presentation for this talk.
- Splendors of the Universe: Eighty slides of the universe,
starting with the sun and the planets, then moving to star-forming
regions within our
Galaxy, to galaxies outside of the Milky Way (our Galaxy), and finally
clusters of galaxies. Sixty of the slides are the most beautiful,
correct-color photographs of astronomical objects that have ever been
taken. All of these pictures are presented with relevant explanations
as to their meaning and significance, with questions solicited from the
audience as the talk progresses.
- Creation of the Elements: an explanation of how
nucleosynthesis in stars created the elements in the universe out of
hydrogen and helium which
were created during the big bang. The iron in your blood was created in
- The Whisper of Creation: how the initial explosion
the universe can be listened to in microwave frequencies. This program
suitable for all school age groups and has been delivered in Vacation
School as well as other school groups. The level can be adjusted for
- Spectra of Stars, Analysis of Starlight: how the spectra
the color of stars reveal their properties. We shall look at the
emission spectra of hydrogen, helium, and neon gas discharge tubes by
hand-held diffraction gratings. We shall discuss the elemental
of the universe, learn why hot stars are bluer and cool stars redder,
look at the absorption spectra of stars to determine their properties.
Present, and Future: An astrolabe was
important astronomical instrument before the telescope was invented,
the most important astronomical calculator before the digital computer
invented. Geoffrey Chaucer of Canterbury Tales fame wrote the
work of science education in 1387, The Treatise of the Astrolabe,
son Lewis. A Star Finder/plainsphere is a partially
functioning astrolabe. A real astrolabe does what a plainsphere does
and much more. Is
it history or science? Astrolabes.org
a URL that I own and is rated by Britannica.com
as the best source of information on Astrolabes on the web.
- Is Most of the Universe Missing? What evidence do
have that 90% of the universe is dark? This traveling talk requires
the audience be familiar with physics and algebra at the high school
level. This is an ideal talk for high school physics classes after they
have learned about circular motion with a radial acceleration of a =
v^2/R and understand Newton's law of universal gravitation F=GMm/R^2.
This is the only traveling talk that requires the audience to
How Seeing the Stars Will Save You Money:
can not see the Milky Way from the Washington Metro area anymore, but
this spectacle could return. In fact, it can be done in such a way as
save millions of dollars-for towns, county, and state government-while
putting more light on the ground where we humans need to see at night
and in the spectral
band (color) at which humans have our peak visual acuity. IDA, International Dark Sky
Eclipses Solar Eclipse in general and the eclipse
11 July 1991 and the eclipse of 26 February 1998 in particular
the subject of this talk and slide presentation.
- Chesapeake Bay Crater 35.5
million years ago, when Washington, DC and Richmond VA were on the
an object hit the earth on the continental shelf in the Atlantic ocean,
37° 17' W 76° 1', causing a crater 85 km in
After sea level fell, this crater would help form the Chesapeake
The impact site is now called the lower Chesapeake Bay in
Modern consequences of an Ancient Cataclysm.
Guatemala, Mexico, Belize, El Salvador, and
Maya. The Maya had a better solar year determination
(tracking of the winter solstice) than
the Europeans did in 1582AD before 900AD, how did they do this?
A computer video projector and screen.. All of these traveling talks
can also be presented within the
planetarium even more effectively to your group if you can visit me.
Please call Dr. Harold Williams at  567-1463 (office)
Harold Williams at Harold.Williams@montgomerycollege.edu
web page by Dr. Harold Williams last modified 7:10PM December 30, 2011.