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- Deneb Algiedi Deneb Algiedi: A Star with Two Names and a Rich History Deneb Algiedi, a name … Stellar Astronomy
- Denebola Denebola: The Tail of the Lion Denebola, a name that evokes images of roaring … Stellar Astronomy
- Densities of Sun and Planets Unraveling the Secrets of Density: Exploring the Sun and Planets In the vast e… Solar System Astronomy
- Density of the Earth Unveiling the Earth's Hidden Weight: Density in Stellar Astronomy The Earth, o… Stellar Astronomy
- Descartes, René René Descartes: The Philosopher-Astronomer René Descartes, renowned for his co… Astronomers
- Descending Node of a planet’s orbit (or comet’s orbit) The Descending Node: Where Planets Cross the Ecliptic In the vast expanse of o… Solar System Astronomy
- De Sitter, Willem Willem de Sitter: Charting the Unbounded Universe Willem de Sitter, a Dutch as… Astronomers
- Deslandres, Henri Alexander Henri Alexandre Deslandres: A Pioneer of Solar Spectroscopy Henri Alexandre De… Astronomers
- De Vaucouleurs, Gérard Gérard de Vaucouleurs: A Pioneer of Planetary and Cosmological Research Géra… Astronomers
- Diagonal Eyepiece Seeing the Stars from a New Angle: Exploring Diagonal Eyepieces in Astronomy O… Astronomical Instrumentation
- Diameter, Apparent Unveiling the Cosmos: Understanding Angular Diameter in Stellar Astronomy When… Stellar Astronomy
- Dichotomy The Celestial Dichotomy: When Planets and Moons are Perfectly Half-Lit In the … Solar System Astronomy
- Differentiation Unveiling the Stars: Differentiation in Stellar Astronomy In the vast expanse … Stellar Astronomy
- Digit (or Finger) Fingers in the Sky: Understanding Digits in Solar and Lunar Eclipses For centu… Solar System Astronomy
- Diminution of Gravity The Subtle Slenderness of Gravity: Understanding Diminution of Gravity Have yo… Cosmology
- Dione Dione: A Jewel in Saturn's Ring System Dione, the fourth largest moon of Satur… Solar System Astronomy
- Dionysian Period The Dionysian Period: A Celestial Dance of Cycles In the vast and intricate ta… Cosmology
- Dioptrics Peering into the Cosmos: Dioptrics in Stellar Astronomy The universe is a vast… Stellar Astronomy
- Diphda Diphda: The Frog Star of Cetus In the vast tapestry of the night sky, stars ho… Stellar Astronomy
- Dip of Horizon The Dip of the Horizon: A Curvature-Induced Illusion When we stand on a beach … Cosmology
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