Because the targets to be observed lie close to the ecliptic (the plane of the earth's orbit around the sun), and the ecliptic is at a slight angle to the earth's axis, the best observation sites are close to the equator.
由於這些小天體多集中在黃道面（地球繞太陽公轉的軌道面），而黃道面與地球成傾斜，最好的觀測點在赤道兩側。