BPAA Lecture Series 2003
Lecture 2
This is a little extra showing recent evidence for water on Mars:
These two links provide reasonably accurate information on Stonehenge:
This link will download a copy of Home Planet, an excellent freeware program showing among other things, the shadow pattern of day and night moving across the earth.
http://www.fourmilab.ch/homeplanet/homeplanet.htmlThis link will provide a brief introduction to celestial coordinates:
The solar azimuth at sunrise with the vernal equinox due east at the right the sun's position at sunrise is shown every two days from the vernal equinox to the summer solstice:
This animation attempts to illustrate the solar "standstill" at the solstice.