astronomical twilight

简明释义

天文晨昏蒙影

英英释义

例句

1.Hikers should be aware that astronomical twilight marks the transition to complete darkness.

远足者应该意识到天文暮光标志着向完全黑暗的过渡。

2.Photographers often prefer to shoot during astronomical twilight for capturing the stars and the Milky Way.

摄影师通常喜欢在天文暮光期间拍摄，以捕捉星星和银河。

3.The best time to stargaze is right after astronomical twilight when the sky is completely dark.

观星的最佳时间是在天文暮光之后，此时天空完全黑暗。

4.During astronomical twilight, the sky is dark enough for astronomers to observe celestial objects without interference from sunlight.

在天文暮光期间，天空足够黑暗，天文学家可以观察天体而不受阳光干扰。

5.Many observatories schedule their public viewing events to start just after astronomical twilight.

许多天文台安排公众观测活动在天文暮光结束后开始。

作文

The beauty of the night sky has captivated humanity for centuries. As the sun sets and darkness envelops the world, there are several phases of twilight that mark the transition from day to night. One of the most intriguing of these phases is known as astronomical twilight. This period occurs when the sun is between 12 and 18 degrees below the horizon, during which the sky becomes dark enough for astronomers to observe celestial objects without interference from sunlight. Understanding astronomical twilight is essential for both amateur and professional astronomers alike, as it signifies the optimal time for stargazing and astronomical observations.During astronomical twilight, the sky reaches a level of darkness that allows for the visibility of faint stars and other celestial phenomena. This phase follows the more illuminated stages of civil and nautical twilight, where the sun is higher in the sky. Civil twilight occurs when the sun is just below the horizon, allowing for sufficient natural light to engage in outdoor activities without artificial lighting. Nautical twilight, on the other hand, is when the sun is between 6 and 12 degrees below the horizon, providing enough light for sailors to take reliable readings of the stars while still being able to see the horizon.For astronomers, astronomical twilight is the golden hour for observing deep-sky objects such as galaxies, nebulae, and star clusters. The absence of sunlight means that the night sky is at its darkest, making it easier to spot these distant wonders. Many observatories schedule their public viewing sessions to coincide with this phase, as it offers the best conditions for appreciating the vastness of the universe. Observing during astronomical twilight can be a transformative experience, allowing individuals to connect with the cosmos in ways that daylight simply does not permit.Moreover, understanding the timing of astronomical twilight is crucial for planning astronomical events such as meteor showers or eclipses. These phenomena often occur during specific times of the year and can be best viewed when the sky is darkest. Astronomers and enthusiasts alike keep track of twilight times using various apps and websites, which provide precise calculations based on geographic location. This knowledge empowers them to maximize their viewing experiences and witness the wonders of the night sky.In addition to its significance for astronomy, astronomical twilight also has implications for environmental science and ecology. Many species of nocturnal animals rely on the gradual transition of light to regulate their behaviors, such as hunting or mating. The timing of astronomical twilight can influence ecosystems, as it marks the point when certain species become active. This interplay between light and life is a reminder of the delicate balance within our natural world.In conclusion, astronomical twilight serves as a fascinating intersection of astronomy, environmental science, and the human experience. It is a period that invites us to look up at the night sky and reflect on our place in the universe. Whether you are an avid stargazer or simply someone who enjoys the beauty of nature, understanding astronomical twilight enriches your appreciation of the world around you. So next time you find yourself under a starlit sky, take a moment to recognize the magic of astronomical twilight and the wonders it unveils.

夜空的美丽吸引了人类几个世纪。随着太阳落下，黑暗笼罩着世界，有几个黄昏阶段标志着白天到夜晚的过渡。其中一个最引人入胜的阶段被称为天文黄昏。这个时期发生在太阳位于地平线以下12到18度之间，此时天空变得足够黑暗，让天文学家可以观察天体而不受阳光的干扰。理解天文黄昏对业余和专业天文学家来说都至关重要，因为它标志着最佳的观星和天文观察时间。在天文黄昏期间，天空达到一种黑暗的程度，使得微弱的星星和其他天体现象可见。这个阶段跟随民用和海洋黄昏这两个更明亮的阶段，当太阳位于地平线以下时，民用黄昏发生，允许在没有人造光源的情况下进行户外活动。另一方面，海洋黄昏是当太阳位于地平线以下6到12度之间时，提供足够的光线让水手能够可靠地读取星星，同时仍然能够看到地平线。对于天文学家来说，天文黄昏是观察深空物体如星系、星云和星团的黄金时刻。缺乏阳光意味着夜空处于最黑暗的状态，使得观察这些遥远奇观变得更加容易。许多天文台安排他们的公众观测会与这个阶段相吻合，因为它提供了欣赏宇宙浩瀚的最佳条件。在天文黄昏期间观察可能是一种改变体验，让人们以白天根本无法实现的方式与宇宙联系起来。此外，了解天文黄昏的时机对规划天文事件如流星雨或日食也至关重要。这些现象通常在特定的时间发生，并且可以在天空最黑暗时进行最佳观看。天文学家和爱好者们使用各种应用程序和网站跟踪黄昏时间，这些工具根据地理位置提供精确计算。这种知识使他们能够最大化观看体验，目睹夜空的奇观。除了对天文学的重要性外，天文黄昏还对环境科学和生态学有影响。许多夜行性动物依赖光线的逐渐变化来调节它们的行为，如捕猎或交配。天文黄昏的时机可以影响生态系统，因为它标志着某些物种活跃的时刻。光与生命之间的这种相互作用提醒我们自然界内的微妙平衡。总之，天文黄昏是天文学、环境科学和人类体验的迷人交汇点。它是一个邀请我们仰望夜空并反思我们在宇宙中的位置的时期。无论你是一个狂热的观星者，还是仅仅喜欢大自然之美的人，理解天文黄昏都会丰富你对周围世界的欣赏。因此，下次当你发现自己在星空下时，花点时间去认识天文黄昏的魔力及其揭示的奇迹。