Calculating Distance from Model Rocket Photo

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To calculate the distance of a model rocket from a photo taken at its peak, one can use the known length of the rocket and its magnification. By photographing the rocket alongside an object of known distance and measuring the pixel size in the image, the distance to the rocket can be determined. The formula to use is: distance to the rocket equals known distance multiplied by the ratio of the unknown size to the known size. This method allows for accurate distance estimation based on image analysis. Understanding magnification is crucial for precise calculations.
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Launched a model rocket with my 5 & 3 year old, have a photo of the rocket straight overhead at the approx peak. Can I figure out the distance? I know the length, and the magnification. What would the formula be?
 
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Depends what you mean by the magnification.

But if you photograph the same object a known distance away and note how many pixels it is on the image then you can work out the distance to the rocket by just comparing the number of pixel on your photo.

So distance rocket = known distance * unknown size/known size
 
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