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- Schmidt, Julius (actually Johann Friedrich Julius) Johann Friedrich Julius Schmidt: A Pioneer of Lunar Mapping and Stellar Discove… Astronomers
- Schonfeld, Eduard Eduard Schönfeld: Charting the Southern Skies Eduard Schönfeld (1828-1891) was… Astronomers
- Schroter, Johann Hieronymus Johann Hieronymus Schröter: A Lost Legacy of Lunar and Planetary Observation J… Astronomers
- Schwabe, Heinrich Heinrich Schwabe: The Apothecary Who Uncovered the Sun's Secret Rhythm Heinric… Astronomers
- Schwarzschild, Karl Karl Schwarzschild: A Pioneer in Theoretical Astrophysics Karl Schwarzschild (… Astronomers
- Schwarzschild, Martin Martin Schwarzschild: A Stellar Architect Martin Schwarzschild (1912-1997) was… Astronomers
- Scintillation The Twinkle of the Stars: Understanding Stellar Scintillation The twinkling of… Stellar Astronomy
- Sclieat Sclieat: A Name Whispered Through the Stars While the vast majority of stars i… Stellar Astronomy
- Scorpio (the Scorpion) Scorpio: The Scorpion's Sting in the Southern Sky Scorpio, the Scorpion, is a … Constellations
- Scorpius (the Scorpion) Scorpius: The Scorpion's Sting in the Night Sky Scorpius, the Scorpion, is o… Constellations
- Sculptor (the Sculptor) The Sculptor's Workshop: Unveiling the Southern Sculptor Constellation The s… Constellations
- Scutum (the Shield) Scutum: The Shield of Sobieski, a Tiny Constellation with a Big StoryIn the vas… Constellations
- Seasons The Seasons: More Than Just Sun and Snow The changing seasons, a familiar rhyt… Solar System Astronomy
- Secchi, Angelo Angelo Secchi: A Jesuit Pioneer of Stellar Spectroscopy Angelo Secchi (1818-18… Astronomers
- Secondary Secondary: A Versatile Term in Stellar Astronomy In the vast tapestry of the c… Stellar Astronomy
- Sections, Conic Tracing the Stars: Conic Sections in Stellar Astronomy In the vast expanse of … Stellar Astronomy
- Sector, Dip Delving into the Depths: Sector and Dip in Stellar Astronomy The vast expanse … Stellar Astronomy
- Sector, Zenith Peering into the Heavens: Understanding Sectors and Zenith in Stellar Astronomy… Stellar Astronomy
- Secular Acceleration of the Moon’s Mean Motion The Moon's Quickening Pace: Understanding Secular Acceleration The Moon, our… Solar System Astronomy
- Secular Variations The Slow Dance of the Planets: Understanding Secular Variations in Stellar Astr… Stellar Astronomy
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