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Welcome to my timeline. I will talk about Mercury.
A scientist named Timocharis made the first recorded observation of Mercury. -
A scientist named Pierre Gassendi made the first telescopic observations of the transit of Mercury across the Sun.
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Giovanni Zupi used a telescope to discover that Mercury had orbital phases similar to Venus and the Moon.
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Astronomers that studied Mercury found zupus on the surface.
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The first telescopic observations of Mercury was made by Galileo.
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Mercury and Venus occult each other every few centuries, this was the first date it was recorded.
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Johann Schröter made observations of surface features, finding 20-kilometre-high (12 mi) mountains
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Giovanni Schiaparelli mapped the planet more accurately, and suggested that Mercury's rotational period was 88 days.
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The effort to map the surface of Mercury was continued by Eugenios Antoniadi, who wrote a book about Mercury and its surface that was published on this date.
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The next occultation of Mercury and Venus.