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- Dip Sector The Dip Sector: A Stellar Navigation Tool for Measuring the Horizon In the rea… Astronomical Instrumentation
- Direct Motion Direct Motion in Stellar Astronomy: A Journey Through the Cosmos The vastness … Stellar Astronomy
- Disc The Celestial Disc: A Window into the Cosmos In astronomy, the term "disc" ref… Solar System Astronomy
- Dispersion of Light Unveiling the Universe's Rainbow: Dispersion of Light in Stellar Astronomy The… Stellar Astronomy
- Disturbing Forces The Dance of the Planets: Unraveling the Disturbing Forces of the Cosmos Our c… Solar System Astronomy
- Diurnal Aberration The Twinkle in the Stars: Diurnal Aberration in Stellar Astronomy The night sk… Stellar Astronomy
- Diurnal Libration The Illusion of a Shifting Moon: Understanding Diurnal Libration The Moon, our… Solar System Astronomy
- Diurnal Motion The Celestial Dance: Understanding Diurnal Motion in Stellar Astronomy Have yo… Stellar Astronomy
- Dollond, John John Dollond: The Man Who Sharpened the Stars John Dollond (1706-1761), a skil… Astronomers
- Donati, Giovanni Battista Giovanni Battista Donati: A Pioneer of Cometary Spectroscopy Giovanni Battista… Astronomers
- Dorado (the Sword-Fish) Dorado: The Swordfish Guiding the Southern Skies Dorado, the Swordfish, is a… Constellations
- Double Stars Unveiling the Secrets of Double Stars: A Tale of Two (or More) Stars The night… Stellar Astronomy
- Draconids The Draconids: A Slow and Steady Meteor Shower Every year, around August 21st … Constellations
- Draco (the Dragon) Draco: The Celestial Dragon Winding Through the Night Draco, the Dragon, is … Constellations
- Dreyer, John Louis Emil John Louis Emil Dreyer: The Man Behind the NGC John Louis Emil Dreyer (1852-19… Astronomers
- Dubhe Dubhe: The Guiding Star of the Great Bear Dubhe, a name sometimes used for the… Stellar Astronomy
- Dynamical Mean Sun The Dynamical Mean Sun: A Guiding Light in Stellar Astronomy In the realm of s… Stellar Astronomy
- Dynamometer Unlocking the Power of the Stars: Dynamometers in Stellar Astronomy While the … Stellar Astronomy
- Dyson, Frank Watson Frank Watson Dyson: A Stellar Administrator and Eclipse Hunter Frank Watson Dy… Astronomers
- Earth Earth: Our Home in the Stellar Neighborhood While the term "Earth" is often us… Stellar Astronomy
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