p. 746 The Sun-Earth-Moon System
International
Solar-Terrestrial Physics
Visit this National Aeronautics and Space Administration (NASA)
site to learn more about the Sun-Earth connection. Click on What is
the Sun-Earth Connection to open a page that explores the interactions
of the Sun and Earth and the space between them. What is geospace?
Digital
Lunar Orbiter Photographic Atlas of the Moon
Go to this site sponsored by the Universities Space Research
Association and NASA to see a complete set of moon images. These images
were taken from a book by Bowker and Hughes (NASA SP-206) titled Lunar
Orbiter Photographic Atlas of the Moon. You can search this site
for images of the moon by feature name, coordinate range, or by latitude
or longitude.
Astronomical
Applications Department Frequently Asked Questions
At this site by the U.S. Naval Observatory you can learn more
about the phenomena of the Sun and the Moon. Click on the Dark Days
of Winter. The sun’s declination is zero at the December solstice. What
does the word solstice mean?
Solar and Thermal Atmospheric Radiation
(STAR)
Visit this National Oceanic and Atmospheric Administration (NOAA) site
to find out more about how variations in the Sun’s radiation affect
Earth’s climate. The STAR program monitors the Sun’s radiation through
a network of surface stations as well as satellites. The program also
measures ultraviolet light to aid in ozone research. Scroll down and
click on measurements to see what kinds of data are collected.
How
Telescopes Work
At this site you can find out all about telescopes. Scroll down
to the graphic outline and click on how they work. Telescopes may be
either refracting or reflecting telescopes. Which of these two types
of telescopes uses mirrors instead of lenses?
Apollo Lunar Surface Journal
Go to this NASA site to learn about the Apollo missions to the Moon.
The site includes journal entries from the flights of Apollo 11 through
17, including the Apollo 13 flight that was aborted. Explore the site
to hear from the Apollo astronauts. The site includes photographs, videos,
and audiotapes of communications between the astronauts and the command
center. This is a very interesting site.
The Moon
Go to this site to learn more about the Moon. Read about some of the missions to the moon and look at some of the images of the moon. To learn about the Moon’s geology, click on the fact sheet. How big is the moon compared to Earth?
p. 765 Solar Eclipses
Solar Eclipses
Visit this interesting site to learn more about solar eclipses and to
view simulations of solar eclipses seen from particular places on Earth’s
surface. There is also a photo gallery of solar eclipses and two short
movies taken during a solar eclipse. Click on eclipse simulations, then
on the date of any past eclipse, to see a simulation of that event.
Espenak's
Eclipse Home Page
At this NASA site you can find out more about eclipses of the
Sun and the Moon. You can look at a particular solar eclipse by scrolling
down and clicking on the date of the eclipse. This site includes detailed
data about each eclipse. For example, you can find the path coordinates
and global maps for central solar eclipses from 1991 through 2030 here.
MrEclipse.com
Go to this site for the ultimate in solar eclipse photography.
Click on Solar Eclipse Photo Gallery to view solar eclipses from 1970
through 1984. Scroll down and click on diamond ring effect during 1970
eclipse to see a larger image. What causes this effect during a solar
eclipse?
p. 770 Eratosthenes’ Contributions to Science and Math
Ask DrMath: FAQ: Prime Numbers
Visit this site to learn about prime numbers and the sieve of Eratosthenes.
What is a prime number? How does the sieve of Eratosthenes help identify
prime numbers?
Eratosthenes
of Cyrene
At this site you can read about Eratosthenes. He was the third
librarian at the famous library of Alexandria, Egypt in 240 B.C. He
wrote about mathematics and his work was used by other famous philosophers.
He is most remembered for his measurements of the circumference of Earth
and of the distances to the Moon and Sun, which have been proven to
be remarkably accurate.
Eratosthenes
(276-195 B.C)
Go to this site to find out how Eratosthenes used geometry to
estimate the circumference of Earth. Besides measurement of the circumference
of Earth, what other important measurements did Eratosthenes make?
