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The first calendars and time-measuring instruments were already used by ancient Eastern civilizations.
measuring time, time, calendar, time-measuring instrument, unit of time, sundial, hourglass, water clock, year, month, day, planetary orbits, planetary motion, antiquity, civilization, Egypt, Sun, Moon, astronomy, Hellas, Earth, axis of rotation, culture
Change of light conditions in different seasons. Measuring height using shadows.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
This animation presents some interesting facts in the field of astronomy.
The Moon is the Earth's only natural satellite
The orbits of the 8 planets in our Solar System are elliptical.
The apparent movement of the Sun is caused by the Earth's rotation around its axis.
A game to practice the use of analog and digital clocks.
Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilization.
The ancient Inca city, located in present-day Peru, is a World Heritage Site.
The world famous monument in England still poses mysteries for archeologist.
Place historical events on the time spiral.
Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.
During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.
The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.