Because of the time and precision involved, photographs of analemmas can be very difficult to produce.
因为涉及到时间和精确度，制作8字曲线照片可能非常困难。
2
Although analemmas traditionally depict the path of the sun, it's also possible to make an analemma of the moon (picture).
虽然8字曲线一般用来描绘太阳路径，但也可以形成月亮的8字曲线(图)。
3
"In the classic way, all analemmas were made on single frames of film using multi-exposure Settings and placing a camera on a fixed platform," TWAN's Tafreshi said in an email.