Grateful acknowledgement is made to the following sources:


Resource 1: Ways of measuring time long ago: Original source: [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] (Accessed 2008)

Resource 2: Water clocks: Original source: (Accessed 2008)

Resource 3: Sundials: Original source: (Accessed 2008)

Resource 4: Units of time: Original source: schools (Accessed 2008)

Every effort has been made to contact copyright holders. If any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangements at the first opportunity.

Resource 4: Units of time

Section 3: Discussing data