Some of the 100+ years old astronomy articles of Scientific American freely available until 30 Nov 2011
A Wonderful Meteor (1846)
The Centre of the Universe (is ...
Alcyone! 1847)
Ancient Astronomical Knowledge (1847)
Miss Herschell (is 97, still observing
like crazy; 1847)
Universal Orrery Globe (1848)
Meteorites: their origin (1848)
The Asteroids (wild rant; 1854)
A Great Planetarium (1855)
Alcyone (Argelander mentioned; 1858)
The Great Astronomical Experiment
(i.e. observing from mountains; 1858)
Astronomy and the Telegraph (1858)
Water on the Planets (1868)
Are Meteors and Falling Stones identical? (1868)
Solar Spots (1869)
Heat from the Moon (1869)
Applications of Photography
to Astronomy (1869)
Astrology and Astrologers (1869)
The Transits of Venus in 1874 and 1882 (1869)
The American Eclipse Expedition (1871)
Sir John Herschel (1871)
The Eclipse Expeditions (mostly failed; 1871)
Progress of Astronomy: The Variable Stars (1872)
The Solar Eclipse, December 1871 (1872)
Cosmical Causes of Changes of Climate (1872)
A Munchausen comet (predicted to impact Earth; 1872)
The Latest Discoveries in the Nature of the Sun (1872)
The Planet Jupiter as Revealed
by the Modern Spectroscope, Photometer, and Telescope (1872)
Astronomical Robbery (at Allegheny Obs.; 1872)
The Discovery and History of the Chromosphere (1872;
sequel)
The Problem of the Coming Transits (1873)
Is the Earth the Only Inhabited World? (1873)
The Planet Mars: Is It Inhabited? (1873;
part 2)
An Automaton Transit of Venus (1873)
A Great 'Lick' in Astronomy:
The Million Dollar Telescope Provided For (1873)
Our Present Knowledge of the Sun (1873)
The Photometer Applied to Astronomy (1873)
The Sun's Distance and How it is measured (1873)
Concerning a Telescope of Unlimited Power (with
a liquid mirror from mercury; 1873)
The Physical Condition of the Planets (1873)
Great Telescopes (1873)
The Transit of Venus (preview; 1874)
The Transit of Venus (early results; 1874)
The Planetary Atmospheres (1875)
Refinements in Modern Astronomical Observations (1875)
The Intra-Mercurial Planet (1876)
Improved Solar Photographic Apparatus (1876)
Vulcan Again (1876)
A new Nebular Theory - possible work for
the astronomers (on spiral nebulae; 1876)
Discovery of Satellites of Mars (1877)
The New Sun and its Disappearance (Nova Cygni
1876; 1877)
Shooting Stars (meteor physics explained; 1877)
Star, Nebula or Meteorite (also Nova Cygni; 1877)
The Progress of Astronomical Photography (1878)
The Planet Vulcan (no doubts anymore; 1878)
The Eclipse: A note from Professor Mitchell (1878)
Formation of Planetary Rings and Satellites (1878)
Sun Spots and Commercial Crises (1879)
Binocular Vision in Telescopes (1880)
An Astronomical Discovery (planetary
nebula spectrum; 1880)
A Giant Artificial Moon (on display; 1881)
Separation of the Comet (1881)
Transits of Venus (1882)
The Great Comet of 1882 (1882; also
here and
here)
The new Princeton Telescope (1882)
Recent Discoveries in the Planet Mars (1882)
The Total Solar Eclipse (1882)
The Transit of Venus (preview; 1882)
The Transit of Venus (was cloudy; 1882)
The Transit of Venus as Seen at the Seagrave Observatory (1882)
The Eclipse as Seen on the Nile (1882)
The Equatorial of the Paris Observatory (1883)
The Total Solar Eclipse of the 6th of May (1883)
The Observatory of the International Bureau
of Weights and Measures (1883)
The Telescope at the Trocadero Observatory (a popular one; 1883)
The Maximum of Sunspots (1884)
Concerning Telescopes (1885)
The Pennsylvania Aerolite (1885)
The Celestial World (photographic sky chart; 1887)
Harvard Observatory and the Henry Draper Memorial (1887)
The Lick Observatory of the University of California (1888)
Recent Astronomical Work at the Lick Observatory (1888)
Maria Mitchell (1889)
Recent Discoveries in the Nebulae by Means of Photography (1889)
The Total Eclipse of the Sun at Lick Observatory (1889)
Inauguration of the Statue of Leverrier (1889)
A Telescope for Schools and General Use (with 4" lens; 1891)
A New Map of the Planet Mars (1892)
The Study of the Stars (1892)
The Great Sunspot of February (1892;
another story)
The Looped Path of Mars (1892)
"A Trip to the Moon" (astronomy show in Berlin; 1892)
Jupiter's New Moon (1892)
William Harkness (Transit of Venus; 1893)
The Total Eclipse of April 16 (1893)
The Mont Blanc Observatory (1893)
The Total Eclipse of the 16th of April in Senegal (1893)
Large recent sunspots (1894)
The Yerkes Observatory (1895)
A Wonderful Photographic Nebula (Barnard's Loop; 1895)
A Drawing of Sunspots (1895)
The Total Lunar Eclipse: Its Astronomical Value (1895)
A Telescope without an Observatory
(Archenhold's in Berlin; 1896)
Recent Observations of Mars (1896)
The Lick Observatory Expedition to Observe
the Total Solar Eclipse of August, 1896, in Japan (1896)
The Yerkes Observatory (1897)
Accident at Yerkes Observatory (1897)
The Observatory of Paris (1898)
The Meteor Display (Leonids disappoint; 1899;
another report & a
preview)
The Great Telescope of the Paris Exhibition
of 1900 (1899)
Total Eclipses of the Sun (1899)
A Photograph of the Solar Eclipse (1900)
Failure of the Display of Leonids (1900)
Color Screen for Telescopes (1900)
The Lick Observatory-Crocker Eclipse Expedition to Sumatra (1901)
Government Eclipse Expedition (1901)
The D. O. Mills Expedition to the Southern Hemisphere (1902)
The Yerkes Observatory two-foot reflector (1902)
A New Equatorial Telescope for Oxford (1902)
Observations of Borrelly's Comet (at Lick Obs.; 1903)
A Nearly Total Eclipse of the Moon Observed
by Means of Photoelectric Selenium Cells (1903)
A Plea for the Endowment of Astronomical Research (1904)
Our Knowledge of the Moon (1904)
Photography of Star Shadows (1904)
The New Solar Observatory at Mount Wilson (1905)
The USNO Eclipse expedition (preview; 1905)
What we know about sunspots (1905)
Measuring the Distance of a Star (1905)
The Astrolabe of Regiomontanus (1905)
The Total Solar Eclipse of 1905 (1906)
New Asteroid Camera at the Naval Observatory (1906)
How the Planets are Photographed (1907)
Daniel's Comet (1907)
The Transit of Mercury (1907)
Observations of Mars during the Recent Opposition (1907)
Saturn's Tores (by P. Lowell; 1907)
A Forgotten Masterpiece:
the Rittenhouse Orrery and Its Maker (1907)
"Knots" in the rings of Saturn (1907)
Some Results from the 1908 Total Solar Eclipse (1908)
The Largest Reflecting Telescope in the World (1908)
Cyclones on the Sun (1908)
Water Vapor on Mars (1908)
The Mountain Telescopes of Switzerland (1908)
Great Storms on the Sun (1908)
The Mystery of Comets (1908)
The Sun's radiation and its study (1908)
The Recurrence of Eclipses (1908)
Photographing a Star Spectrum (at Yerkes Obs.; 1909)
The Scientific Work of the Late Prof. Simon Newcomb (1909)
The Peculiar Behavior of Morehouse's Comet
(disconnection event; 1909)
A Huge Planetarium (at the AMNH; 1909)
Halley's Comet (1909)
The Return of Halley's Comet (1909)
(Searches were done for "astronomy", "observatory", "transit of venus", "argelander", "eclipse",
"planetarium", "astrology", "meteors" and "mars")