The former correct for the varying time-delays by using an approximation of the binary orbit which is valid only if the observation time is much less than the orbital period of the binary system.
前一种通过近似的双星轨道对时间延迟进行修正，只在观测时间远小于双星系统的轨道周期时才有效。
The former correct for the varying time-delays by using an approximation of the binary orbit which is valid only if the observation time is much less than the orbital period of the binary system.
前一种通过近似的双星轨道对时间延迟进行修正，只在观测时间远小于双星系统的轨道周期时才有效。
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