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2017
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Outdoor small knowledge, there is no clock how to judge the time?

What do you do if you don't have a clock in the wild and you want to know what time it is? According to the basic knowledge of the earth's rotation and revolution of the moon, the day when the sun moves, the evening by the moon moves to determine the correct time, but it is related with the season, latitude and longitude, so it is not very accurate.

If you carry a compass or compass, compass or compass in the center of a match, or a pointer to the compass compass north south direction, observe the matchstick refers to the direction of the shadow, shadow rod pointing West (W) is the morning, pointing to the East pole shadow (E) is refers to the North Pole on the afternoon, (N) is noon, according to the moving trajectory of lever shadow may be judged as early as six am to six pm time.

Can also manufacture simple sundial myself: cardboard two, according to local latitude coangle placement, on a piece of cardboard in the clockwise direction from 1 to 24 draw a good case, the needle in the central case. When the case should be placed with the north. In March -9 month according to the law for such cases, 10-2 months, should be from the bottom of the needle will be inserted in the above board and back on the back in counter clockwise direction to draw the case.

If time can use the moon at night, the moon from east to West in about 12 hours, the average per hour to 15 degrees, can be combined with the moon and the moon's position at the time of observation.

According to the measurement time of the stars, the simplest is to bear the amount from Polaris seat bucket bottom concave beta star cited an imaginary line, this line represents the idea of pointer clock, Polaris location for the dial center, can determine the time like a clock read 12 digital that this usually need you in the clear night sky with clock time often observed the sky, remember the location, when used on hundreds of times.

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