Hi All,
Today was the Autumn Equinox and as you would expect the length of day and night are the same.
This results in the Day/Night terminator as seen from space, moving accros Australia being parallel with the lines of longitude.
I have capture todays satellie images from the Australia Weather Bureau and made the following gif file to show its movement across Australia.
http://www.cwjames.info/astro/howto/autumn-2008.php
It's even more interesting if you then see how the Day/Night terminator changes between the winter Solstice and Spring Equinox. The Day/Night terminator changes its angle in relation to the lines of longitude. See the second animation below.
http://www.cwjames.info/astro/howto/...pring-2007.php
I know this is simple stuff, but I find it interesting to see this.
Thanks for reading.
Chris