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- Hooke, Robert Beyond the Law: Robert Hooke, the Unsung Hero of Astronomy While Isaac Newton'… Astronomers
- Horary The Hourglass of the Cosmos: Exploring "Horary" in Stellar Astronomy The ter… Stellar Astronomy
- Horizon, Celestial The Celestial Horizon: A Window to the Stars In the realm of stellar astronom… Stellar Astronomy
- Horizon, Rational The Rational Horizon: A Celestial Reference Point In the vastness of space, … Astronomers
- Horizon, Sensible The Horizon: Where Earth Meets the Sky in Stellar Astronomy In the vast expans… Stellar Astronomy
- Horizontal Parallax Unmasking the Stars: Horizontal Parallax and the Immensity of Space Imagine h… Stellar Astronomy
- Horologium (the Clock) Horologium: The Timekeeper of the Southern Skies Horologium, Latin for "cloc… Constellations
- Horrocks, Jeremiah Jeremiah Horrocks: A Star that Burned Too Bright Jeremiah Horrocks (1618-1641)… Astronomers
- Hour Angle The Hour Angle: Timekeeping in the Stellar Sky In the vast canvas of the night… Stellar Astronomy
- Hour Circle Navigating the Cosmos: The Hour Circle in Stellar Astronomy Imagine you're sta… Stellar Astronomy
- Howse, Derek Derek Howse: A Stellar Navigator Derek Howse, a name synonymous with navigatio… Astronomers
- Hubble, Edwin Powell Edwin Hubble: A Giant Among Stars Edwin Powell Hubble, born in 1889, was a man… Astronomers
- Huggins, William William Huggins: A Pioneer in the Dawn of Stellar Spectroscopy William Huggins… Astronomers
- Humason, Milton La Salle Milton La Salle Humason: A Self-Taught Giant in the Realm of Galaxies Milton L… Astronomers
- Hunter’s Moon The Hunter's Moon: A Celestial Spectacle Marking the Turn of the Season In the… Solar System Astronomy
- Huygens, Christiaan Christiaan Huygens: A Master of the Skies and Time Christiaan Huygens (1629-16… Astronomers
- Hyades The Hyades: A V-Shaped Family in Taurus Gazing at the night sky, you might not… Stellar Astronomy
- Hydra (the Female Water Snake) The Hydra: A Serpent of the Stars In the celestial tapestry, constellations … Constellations
- Hydrus (the Male Water Snake) Hydrus: The Water Snake of the Southern Sky In the vast celestial canvas of … Constellations
- Hyperbola Hyperbolas in the Stellar Cosmos: A Journey Beyond the Familiar In the vast ex… Stellar Astronomy
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