输入任意地点的经度、纬度，就可以通过天文计算公式计算出当地的日出、日落时间-Enter any place of longitude, latitude, it can be astronomical calculation formula to calculate the sunrise, sunset time

白塞尔公式计算经度纬度两点间的距离很精确-Serge White latitude longitude calculated the distance between two points is very precise

这VB.net程序计算太阳的视角度从你的角度,在任何时候,纬度和经度。它不是编码与极准确的公式,但很接近公式-This VB.net program to calculate the sun' s degree from your point of view, at any time, latitude and longitude. It is not very accurate coding and formulas, but very close to the formula