During the Gemini, Apollo, and Skylab missions, nomographic charts were used by astronauts as a back-up method for computing the delta-velocity vectors for on-board targeted rendezvous burns. These "chart solutions" were used to cross check delta-velocity solutions obtained from the spacecraft on-board computer(s) and Mission Control. In the event of a communications loss or on-board computer failure, chart solutions could be used as a source of delta-velocity data to complete the rendezvous. In late 1972, at the end of the Apollo Program, NASA engineer Jon C. Axford developed an analog computation device that provided burn solutions faster and with less effort than previously used graphical chart solution methods. The theory behind Axford's Generalized Intercept Maneuver (GIM) chart provides insight into the dynamics of rendezvous.
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机译：在双子座，阿波罗和Skylab飞行任务中，宇航员使用列线图作为备份方法来计算机载目标集合点燃烧的速度矢量。这些“图表解决方案”用于交叉检查从航天器机载计算机和“任务控制”获得的三角洲速度解决方案。如果发生通信丢失或机载计算机故障，可以将海图解决方案用作增量速度数据的来源，以完成集合点。 1972年末，阿波罗计划（Apollo Program）结束时，美国宇航局（NASA）工程师乔恩·阿克斯福德（Jon C. Axford）开发了一种模拟计算设备，与以前使用的图形化图表求解方法相比，它可以更快，更省力地提供刻录解决方案。 Axford的通用拦截机动（GIM）图表背后的理论提供了对集合点动态的洞察力。
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