celestial pole

简明释义

黄极

英英释义

例句

1.Navigators use the celestial pole to determine their latitude when sailing.

航海者使用天极来确定他们在航行时的纬度。

2.During winter nights, the celestial pole can be a guide for stargazers looking for constellations.

在冬季的夜晚，天极可以作为观星者寻找星座的指引。

3.The North Star is located near the celestial pole, which is the point in the sky directly above the Earth's North Pole.

北极星位于天极附近，这是天空中直接位于地球北极上方的点。

4.The stars appear to rotate around the celestial pole due to the Earth's rotation.

由于地球的自转，星星似乎围绕着天极旋转。

5.In astronomy, understanding the location of the celestial pole is essential for mapping the night sky.

在天文学中，了解天极的位置对于绘制夜空至关重要。

作文

The night sky has always fascinated humanity, inspiring countless tales and guiding explorers through uncharted territories. Among the most significant features of the celestial sphere are the celestial poles (天球极), which play a crucial role in our understanding of astronomy and navigation. The celestial poles are the points where the Earth's axis of rotation intersects the celestial sphere. In simpler terms, they are the projections of the Earth's North and South Poles into the sky. These points are not just arbitrary; they help astronomers and navigators locate stars, planets, and other celestial bodies with precision.To comprehend the importance of the celestial poles (天球极), one must first understand how the Earth rotates. As the Earth spins on its axis, it creates a diurnal motion that makes the stars appear to move across the night sky. This apparent movement is a result of the Earth's rotation and is best observed when one looks towards the celestial poles. For instance, in the Northern Hemisphere, the North Star, or Polaris, is located very close to the North celestial pole. This makes it an essential reference point for navigation, as it remains relatively fixed in the sky while other stars rotate around it.In ancient times, sailors relied heavily on the celestial poles (天球极) and the stars to guide their journeys across vast oceans. By identifying the North Star, they could determine their latitude and maintain a steady course. This practice laid the foundation for modern navigation techniques. Even today, the principles of using the celestial poles remain relevant, although technology has introduced more advanced methods such as GPS.Moreover, the celestial poles serve as vital reference points in astronomy. They help astronomers map the positions of stars and galaxies in the universe. By understanding the location of the celestial poles (天球极), astronomers can create accurate star charts and predict celestial events such as eclipses and meteor showers. These calculations are essential for both amateur stargazers and professional scientists alike.Another fascinating aspect of the celestial poles is their relationship with the concept of circumpolar stars. In regions near the North Pole, certain stars never set below the horizon, making them visible all night long. These stars, known as circumpolar stars, revolve around the North celestial pole in a circular motion. This phenomenon is not only captivating but also serves as a reminder of the dynamic nature of our universe.In conclusion, the celestial poles (天球极) are more than mere points in the sky; they are integral to our understanding of the cosmos. Their significance spans from ancient navigation practices to modern astronomical research. As we continue to explore the universe, the celestial poles will undoubtedly remain a focal point in our quest for knowledge and discovery. Whether you are gazing at the stars from your backyard or studying the intricate details of the cosmos through a telescope, the celestial poles provide a constant reminder of our place in the universe.