Understanding Earth's rotation and revolution of the earth

Rotation of the earth on its axis is called rotation. Kala rotation is used for one-time rotation. When the rotation of the earth for 24 hours or a day. Earth rotates very fast, but we can not feel it. Due to the rotation of the earth there was the turn of the day and night. Part of the earth which leads to experiencing daytime sun. Part of the earth to the sun experienced a night. In addition to rotating, the Earth also evolved. Revolution is a rotary motion around the sun. Earth do once the revolution against the sun (when the revolution) for a year or 362 days 6 hours 9 minutes 10 seconds. The influence of the revolution and rotation of the earth is used as the basis for solar calendar, which determined that the first days, 24 hours and 365 days a year. Determination was not exactly the same as the old rotation and revolution of the earth. The change was made on February 29. Years have additional one day was called a leap year, for example in 1200, 1600, 1800, 1988 and 2000 and so on.
Earth also has other movements that precession. This motion caused by the influence of the moon, causing changes in the direction of the axis of rotation of the earth. Precession very long time that is 25,600 years old. Demonstration precession can be seen in the planetarium projector Jakarta. Kala rotation with the same month when the moon on the earth's revolution, which for 29 ½ days.