exmeridian reduction

简明释义

近中天高度修正量

英英释义

例句

1.In astronomy, exmeridian reduction is essential for accurate star positioning.

在天文学中，经度修正法对于准确的星体定位至关重要。

2.Understanding exmeridian reduction can greatly enhance one's navigation skills.

理解经度修正法可以大大提高一个人的导航技能。

3.During the training, the instructor emphasized the importance of exmeridian reduction in celestial navigation.

在培训期间，讲师强调了经度修正法在天文导航中的重要性。

4.The sailor used the method of exmeridian reduction to adjust his celestial navigation calculations.

水手使用经度修正法来调整他的天文导航计算。

5.The captain explained how exmeridian reduction helped them determine their exact location at sea.

船长解释了经度修正法如何帮助他们确定海上的确切位置。

作文

In the field of astronomy and navigation, precise measurements are crucial for determining positions on Earth. One of the important concepts that navigators and astronomers must understand is the process of exmeridian reduction. This term refers to the adjustment made to celestial observations to account for the time difference between when an observation is taken and when it is intended to be used for navigation or astronomical calculations. It essentially corrects the observed altitude of a celestial body to reflect its position at the meridian, which is the highest point in the sky it reaches during its transit.Understanding exmeridian reduction is essential for accurate navigation, especially when using sextants or other observational tools. When a navigator takes a sighting of a star or planet, they often do so at a time that is not precisely at the local noon when the celestial body is at its highest. This discrepancy can lead to errors in determining latitude and longitude if not corrected. The exmeridian reduction brings the observation back to the meridian time, thus ensuring that the calculations made from that observation are as accurate as possible.The process involves a series of calculations that take into account the angle of the celestial body above the horizon at the time of observation and the time elapsed since the last meridian passage. By applying the exmeridian reduction, navigators can adjust their readings to reflect what the altitude would have been if the observation had been made at the meridian. This is particularly important in maritime navigation where even small errors can lead to significant deviations from the intended course.Moreover, the importance of exmeridian reduction extends beyond just navigation. In astronomy, it allows astronomers to make more accurate predictions about the positions of celestial bodies. When conducting research or observations, astronomers need to ensure that their data reflects the true position of stars and planets at specific times. Without the exmeridian reduction, their findings could be skewed, leading to incorrect conclusions about celestial movements and behaviors.In conclusion, the concept of exmeridian reduction plays a vital role in both navigation and astronomy. It is a fundamental adjustment that ensures the accuracy of celestial observations, allowing navigators to chart their courses effectively and astronomers to conduct reliable research. Understanding this term and its implications is essential for anyone involved in these fields, as it highlights the importance of precision in measurements and calculations. As technology continues to advance, the principles behind exmeridian reduction remain relevant, serving as a reminder of the intricate relationship between time, position, and observation in our understanding of the universe.

在天文学和航海领域，精确的测量对于确定地球上的位置至关重要。导航员和天文学家必须理解的一个重要概念是经度减法的过程。这个术语指的是对天体观测进行的调整，以考虑观测时间与用于导航或天文计算的时间之间的时间差。它本质上是将天体的观察高度校正为其在子午线时的位置，即它在天体经过时达到的最高点。理解经度减法对于准确导航至关重要，特别是在使用六分仪或其他观测工具时。当导航员对星星或行星进行观测时，他们通常是在不精确的地方进行观测，而不是在当地正午时天体达到最高点的时刻。如果不进行校正，这种差异可能会导致纬度和经度的确定出现错误。经度减法将观测值调整回子午线时间，从而确保从该观测中得出的计算尽可能准确。这一过程涉及一系列计算，考虑到观测时天体在地平线上方的角度以及自上次通过子午线以来经过的时间。通过应用经度减法，导航员可以调整他们的读数，以反映如果在子午线时进行观测，天体的高度将是什么。这在海洋导航中特别重要，因为即使是小的错误也可能导致航向的重大偏离。此外，经度减法的重要性不仅限于导航。在天文学中，它使天文学家能够更准确地预测天体的位置。当进行研究或观测时，天文学家需要确保他们的数据反映特定时间星星和行星的真实位置。如果没有经度减法，他们的发现可能会偏差，导致对天体运动和行为的错误结论。总之，经度减法的概念在导航和天文学中发挥着至关重要的作用。这是一个基本的调整，确保天体观测的准确性，使导航员能够有效地绘制航线，天文学家能够进行可靠的研究。理解这个术语及其影响对于任何参与这些领域的人来说都是必不可少的，因为它突显了测量和计算中精确的重要性。随着技术的不断进步，经度减法背后的原理仍然相关，提醒我们时间、位置和观测在我们理解宇宙中的错综复杂的关系。