On 2006-08-04, Roy Smith wrote:
You see two lights at 12 O'Clock. Is the other aircraft moving towards you
or away from you? Would it help if I told you what color the two lights
were?

You only have to be able to determine the colour of one light. Since the
red/green lights only shine forward, if you see a colour other than
white, you know the other aircraft is facing you.

Since colour deficient people can at least determine one of red or
green, that's sufficient to tell whether the other aircraft is facing
you or has its tail to you.

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