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Measuring time

The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.



measuring time, time, calendar, time-measuring instrument, unit of time, sundial, hourglass, water clock, year, month, day, planetary orbits, planetary motion, antiquity, civilisation, Egypt, Sun, Moon, astronomy, Hellas, Earth, axis of rotation, culture

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Change of light conditions in different seasons. Measuring height using shadows.

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

Change of seasons (intermediate)

Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.

Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.

Ancient agriculture in the Nile Valley

Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.

Phases of the Moon

During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.

Satellite navigation, GPS

The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.

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