NASA
Nasa: Goddard Institute for Space Studies: Time on Mars
This site provides a Java-based program called Mars24. You can download this to your computer to keep track of time on Mars.
Curated OER
Using the Sun Clock
Very simple directions for making a sundial and a question and answer section that explains why and how a sun clock works.
Curated OER
Finding the Two North Poles
Very simple directions for making a sundial and a question and answer section that explains why and how a sun clock works.