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Anonymous users2024-02-08The earth rotates 360 degrees in 24 hours and 15 degrees in an hour, and the hour hand of a watch always rotates twice as fast as the sun. At 6 o'clock in the morning, the sun is in the east, and the shadow points to the west, at this time, the hour hand on the watch points to the sun, and the "12" on the dial points to the west, if the dial rotates 90 degrees, it is half folded at 6 o'clock, so that the "3" on the dial is facing the sun, and the "12" is pointing to the north; At 12 noon, the sun is in the south, and the 12 is halved so that the "6" on the dial is facing the sun, and the "12" still refers to the north (fig. 6).
According to this method, the direction is determined, taking into account the local time difference. Beijing time should be converted to local time. Based on the 120th parallel of east longitude, Beijing time is added by one hour for every 15 degrees of longitude to the east, and Beijing time is subtracted by one hour for every 15 degrees to the west.
For example, if the geographical coordinates of Urumqi are 87 degrees 40 minutes east longitude, then (120° 87°) 15° 2 hours and 9 minutes, and Beijing time minus 2 hours and 9 minutes, is the local time of Urumqi.
The above two methods cannot be used in the area south of the Tropic of Cancer (23 degrees 27 minutes north latitude) in Chiayi, Taiwan, Nanao Island, northeast of Shantou, Guangdong, Wuzhou City, Guangxi, and Gejiu City in Yunnan.
By the way, we know that the Earth and the Sun move 15° relative to each other during the rotation of the Earth, and we can roughly determine the direction with a watch and the Sun. Conversely, we can also determine the approximate time with a compass and the sun. To do this, use a compass to orient the sun north, and divide the reading of the sun's bearing by 15.
In China, Beijing time is the standard, Beijing is on the east longitude 120 ° line, and other regions should be corrected according to the longitude difference, that is, the correct solar time.
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Anonymous users2024-02-07Unless your watch comes with a compass.
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Anonymous users2024-02-06It's important to know where you're headed. Don't panic if your compass is lost or damaged, you can tell the way by the sun during the day and the stars at night.
The sun during the day.
The sun rises in the east and sets in the west, so you can find the east-west direction according to it. Just add a watch and you'll find the north-south direction (depending on which hemisphere you're in). If the weather is cloudy, it is judged by the brightest place in the sky.
Northern Hemisphere. Point the hour hand in the direction of the sun, imagine a line between it and 12 o'clock, and the direction it points to is south.
Southern Hemisphere. Aim 12 o'clock in the direction of the sun, and the hour hand and ** at 12 o'clock point north.
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Anonymous users2024-02-05Yes, I read it in a geography book, but I forgot, it's roughly what the 2nd floor says.
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Anonymous users2024-02-04No, it wouldn't be to ask this question
Is the head suffering from heat stroke?
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Anonymous users2024-02-03If it's sunny, you can roughly judge the direction of the day according to the time of day and the position of the sun (of course, the four seasons are different), and you can see the Big Dipper at night.
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