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Miscellaneous correspondence concerning the dates of the greatest brilliancy of Venus, movement of the solar system in space, the seasons, etc., 1889.
Miscellaneous correspondence concerning light from Sirius, advice on telescopes, sunrise times, equinoxes, etc., 1890.
Miscellaneous correspondence concerning sidereal time, the transit of Mercury, star charts, atlases, sunspots, etc., 1891.
Miscellaneous correspondence concerning the speed of planets, the Sun's position, telescopes, etc., 1902-1907.
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