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T plus (or T minus) usually refers to a specified time, plus or minus however many minutes. So for example, when NASA launches the space shuttle, they have very specific launch times calculated down to the minute - 07:43 AM. So instead of referring to that specific time, when it may be sensitive information anyway, they refer to it as "T-time". Knowing this we can say that T plus 10 minutes is 07:53 AM, and T minus 10 minutes is 07:33 AM.

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7t 7t 7t ;7t;t7 t7 ; it; ; t; ;t ;t7t ;t t; tt t ;t ;it ; ;'// / 7ui. i..i . ..i/ oo8uu.