"To find a variable star, you have to be able to discern a difference of 0.05 magnitude, and must keep continuous detailed records of the observation," says Tsai.
「觀測變光星，必須能測出廿分之一的光度差，且要持續精密的觀察記錄」，蔡章獻說，這些非長期累積經驗和知識不可得。