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The ratio of the spacing of the fingers and the distance from your eye will be the same as the ratio of the height of the object to its distance from you, so Hf/Df = Ho/Do and Do = HoDf/Hf

Q: How do I calculate the distance between current location and a distant visible object if the only information available is the height of the object and the distance between 2 fingers at your eye?

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Homefinder provides you with the latest information in regards to homes for sale in your area by searching via a designated address or location. Homefinder also provides information on available mortgages and possibly homes for foreclosure.

It isn't clear what you want to calculate.

Only if you know your location (the coordinate on the distance scale and the time scale) where "you" are can you infer if the object is moving towards you (the absolute distance to the object is decreasing) or away from you (the distance is increasing).

A little bit more information is required - like location.

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