Movement of the Earth

Procession torque

The movement of the Earth is how the Earth moves. There are two movements;

• Rotation - the movement of the Earth on this Axis
• Revolution - the movement of the Earth around the sun.

Axis

The axis is an imaginary line running through the center of the Earth from the North Pole to the South Pole. The Earth is tilted at an angle and rotates around the axis.

The solar year

The period of time required of the Earth to make a complete revolution around the Sun measured from one vernal equinox, to the next, is equal to 365 days and 6 hours. Also called astronomic gear ar tropical gear.

Questions

Why aren't the 365 day that make p.a. years all the same?

• Because the years take 365 days and 6 hours, every fourth year has an extra day. This is known as a leap year.

Definitions

• The winter solstice - the first day of winter.
• The autumn equinox - the first day of autumn.
• The solstice - one of the two times of the year when day and night are of equal length.
• The vernal equinox - the first day of spring.
• The summer solstice - the first day of summer.

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