Tag Archives: Historical transits

Measuring the size of the Solar System – Parallax

By guest blogger Peter Bond Edmond Halley’s method, which involved observations of a transit made from widely spaced places, was based on the principle of parallax. This uses the fact that objects appear to shift position against a fixed background … Continue reading

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Measuring the size of the Solar System – the ‘black drop’ problem

By guest blogger Peter Bond Despite the best efforts by astronomers who voyaged to far flung reaches of the Earth to watch the transits, the results of the observations was not as conclusive or accurate as had been hoped. The … Continue reading

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Measuring the size of the Solar System – transits through the ages

By guest blogger Peter Bond The first person to predict a transit of Venus was the German mathematician and astronomer, Johannes Kepler, who calculated that one would take place on 6 December 1631. Unfortunately, the transit was not visible from … Continue reading

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