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How to measure the passage of time

• Introduction
• Time in science
• Motion
• Velocity
• Periodic motion
• The period of a pendulum
• Elasticity phenomenon
• Elastic pendulum
• Pendulum clock
• Natural periodic motions
• Earth shape
• Poles, meridians and circle of latitude
• Latitude and longitude
• The apparent motion of the Sun
• The motion of revolution of the Earth
• The sidereal day and the solar day
• The time in the various points of the Earth
• The date change line
• Gnomon
• The sundial
• Summer time
• Calendar
• Moon: Earth satellite
• Month
• Lunar phases
• Moon eclipse
• Sun eclipse
• The age of the trees