秒
second (time/angle/coordinate unit)
Meanings
3 senses · 15 examplesquantifier
second (time unit)
Standard international unit of time, symbol ′
Sprinters' results can be accurate to one hundredth of a second.
He finished the 100-meter race in just 9.83 seconds.
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One class lasts 45 minutes, which is 2700 seconds.
The heart beats about 60 to 100 times per minute, which is 1 to 2 times per second.
Countdown starts: 10, 9, 8... 3, 2, 1, Happy New Year!
quantifier
second (angular unit)
technicalUsed in geometry, cartography and surveying, symbol ′
This precision instrument can measure angular errors of 0.1 seconds.
Astronomers need to calculate star positions accurate to the second of arc.
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A full circle can be divided into 360 degrees, 21600 minutes, 1296000 seconds of arc.
The apex angle of this triangle is 30 degrees 15 minutes 20 seconds.
In marine navigation, coordinate readings need to be accurate to the second.
quantifier
second (geographic coordinate unit)
technicalUsed to specify exact geographic locations, symbol ′
The coordinates of this ancient building are 39 degrees 54 minutes 26 seconds north latitude, 116 degrees 23 minutes 29 seconds east longitude.
GPS can help us locate geographic coordinates accurate to the second.
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The finish line of this marathon is located at 22 degrees 18 minutes 15 seconds north latitude.
The longitude difference between the two places is 15 seconds, which means a time difference of about 0.04 seconds.
When marking village locations on a map, we need latitude data accurate to the second.