用于计算从两地球经纬度之间的距离,其核心是计算赤道曲率和极曲率.-Used to calculate the latitude and longitude from both the distance between the Earth and its core is the calculation of the equatorial and polar curvature curvature.

通过经纬度数据，直接计算2点之间的距离，包含VC、VB源代码，以及Excel发式求解的方法。-By latitude and longitude data, direct calculation of the distance between 2 points, including VC, VB source code, as well as Excel hair solution approach.

根据地球桑两个点的经度和纬度，计算两点距离，比较精确的说。-According to the Globe Sang two points of latitude and longitude, calculate distance between two points, more precise to say.

太阳影子定位问题中第n天的太阳直射点纬度，n为距离春分的天数，春风当天n=0。(Solar shadow positioning problem in the first n days of the sun direct point latitude, n is the distance from the vernal equinox days, spring day n=0.)