of one arcsecond (by placing the observer at D and a disc spanning ES).

Mathematically, to calculate distance, given obtained angular measurements from instruments in arcseconds, the formula would be:

where ? is the measured angle in arcseconds, Distance_earth-sun is a constant ( or 1 au). The calculated stellar distance will be in the same measurement unit as used in Distance_earth-sun (e.g. if Distance_earth-sun = , unit for Distance_star is in astronomical units; if Distance_earth-sun

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