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I am trying to describe the positional relationship between the red circle and the green triangle with reference to direction A indicated by the blue arrow. I thought of two examples:

  1. The red circle is located above the green triangle in direction A.
  2. The red circle is located downstream of the green triangle in direction A.

Are there any problems with my examples?

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  • How did you come up with "upstream"? Some similar usage? Off the top of my head it doesn't seem to fit.
    – user3169
    Oct 11 '18 at 2:55
  • I made a mistake and corrected it to "downstream".
    – rama9
    Oct 12 '18 at 2:13
  • I can't resolve directional movement with stationary objects, so I'm still not clear what you are asking. Perhaps "The red circle is ahead of/in front of the green triangle"?
    – user3169
    Oct 12 '18 at 4:53
  • Direction A is an undefined direction, so may be a vertical upward direction, a vertical downward direction, a north direction, a south direction, a southeast direction, or ... I would like to know how to describe the positional relationship between two stationary objects by using such a direction. It seems that "ahead of/ in front of" makes sense.
    – rama9
    Oct 12 '18 at 5:29
  • Upstream/downstream it's the same. There's no absolute direction. Up can be up, but it needn't be. That's why we have coordinate systems. Oct 12 '18 at 9:16
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Neither sentence you show is applicable.

The red circle is located above and to the right of the green triangle.

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  • I would like to use "direction A ".
    – rama9
    Oct 12 '18 at 1:46
  • There is no single word in English for "direction A", AFAIK. If it were a map, one could say northeast, or on a protractor, at 45 degrees or at 1/4 pi radians, or as @Tᴚoɯɐuo suggests, use military 'clock' terminology. Oct 12 '18 at 2:13
  • I think "above" can be used with reference to "vertical directions". I would like to define a certain direction and then explain a positional relationship between two objects with reference to the certain direction.
    – rama9
    Oct 12 '18 at 2:19
  • Yes, but the direction is not only above, but to the right -- not an orthogonal direction. Oct 12 '18 at 2:25
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In informal contexts you can use the analogue clock-face:

The triangle is at the circle's eight o'clock.

The circle is at the triangle's two o'clock.

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  • I would like to use "direction A ".
    – rama9
    Oct 12 '18 at 1:46

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