circle of declination

简明释义

时圈

英英释义

例句

1.The circle of declination helps navigators correct their bearings.

在导航中，偏角圈帮助导航员修正他们的方位。

2.The navigator adjusted the compass to account for the circle of declination.

导航员调整了指南针以考虑偏角圈。

3.Astronomers often refer to the circle of declination when locating stars in the sky.

天文学家在定位天空中的星星时常常提到偏角圈。

4.Understanding the circle of declination is crucial for accurate map reading.

理解偏角圈对准确的地图阅读至关重要。

5.Pilots must consider the circle of declination when planning their flight paths.

飞行员在规划航线时必须考虑偏角圈。

作文

In the field of astronomy, understanding celestial navigation is crucial for both professional navigators and amateur stargazers. One of the essential concepts that come into play is the circle of declination (赤纬圈). This term refers to a circle on the celestial sphere that represents the declination of celestial objects from the celestial equator. Declination is similar to latitude on Earth; it measures how far north or south an object is from the celestial equator, which is at 0 degrees declination. The circle of declination (赤纬圈) is significant for several reasons. First, it helps astronomers determine the position of stars and other celestial bodies in the night sky. By knowing the declination of a star, one can easily locate it using a star chart or a telescope. For instance, the North Star, Polaris, has a declination of approximately +89 degrees, which means it is located very close to the North Celestial Pole. Furthermore, the circle of declination (赤纬圈) plays a vital role in celestial navigation. Sailors and aviators use this concept to navigate across vast oceans and skies. By measuring the angle between the horizon and a celestial body, they can determine their latitude, and by knowing the time, they can calculate their longitude. This method has been used for centuries and remains a reliable technique even in the modern age of GPS technology. In addition, the circle of declination (赤纬圈) is not static; it changes due to the precession of the equinoxes, a phenomenon caused by the Earth's axial tilt. This means that over long periods, the positions of stars relative to the celestial equator shift slightly. Astronomers must account for these changes when making long-term observations or predictions. Moreover, the circle of declination (赤纬圈) is also essential in the study of the Earth's climate and seasons. The declination of the Sun changes throughout the year as the Earth orbits around it. This variation causes the seasons, as different parts of the Earth receive varying amounts of sunlight at different times of the year. During the summer solstice, for example, the Sun reaches its highest declination, leading to longer days and warmer temperatures in the northern hemisphere. Conversely, during the winter solstice, the Sun's declination is at its lowest, resulting in shorter days and cooler temperatures. In conclusion, the circle of declination (赤纬圈) is a fundamental concept in astronomy that has practical applications in navigation, timekeeping, and understanding Earth's climatic patterns. By grasping the significance of declination and its implications, we can enhance our appreciation of the universe and our place within it. Whether you are a seasoned astronomer or simply a curious observer of the night sky, understanding the circle of declination (赤纬圈) enriches your experience and knowledge of the cosmos.