The maximum possible parallax of Mercury during solar transit, as seen from either end of a 2100 km baseline on Earth is calculated below:
Using the formula:
- (Earth to Sun) - (Mercury at Aphelion or Mercury Perihelion) = Max Parallax.
- Here, we have, Earth to Sun = 149,500,000 km in distance;
- Mercury at Aphelion Mercury at Perihelion = 69,800,000 km;
Therefore we have:
- (149,500,000 - 69,800,000) km = 79,700,000km.
Hence, Parallax:
- 2,100 ÷ 79,700,000 = 0.0000263
- Radian: 0.0000263 x (180 ÷ pi) degree x 3,600 = arcsec = 5.4223 arcsec or 5 arc seconds.
Hence, in his case, the maximum possible parallax of Mercury during solar transit, as seen from either end of a 2100 km baseline on Earth is "5 arc seconds."
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