“日界线”与“晨昏线”的计算方法

Calculation Method of the“Dateline”and“Twilight line”

"日界线"与"晨昏线"方面的计算问题一直是令广大学生头疼的问题,究其原因大部分学生是对二者的概念有些模糊,也有的学生是在读图时不会提取有效信息,还有的学生是在做题过程中抓不住主线,不会利用已知条件或信息。下面以部分题为例予以剖析,望其对广大学生有所帮助。

The calculations of "Dateline" and "twilight line" has been the troublesome problem of the students, the most reason of the students is a vague concept of the two, some students will not extract useful information, and some students do not catch the main problem, not the use of known conditions or information. The following analysis to the part of problem will be helpful for the students.