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- Hercules Hercules: The Strongman of the Stars In the tapestry of the night sky, constel… Constellations
- Hercules (the Hercules) The Hero in the Sky: Exploring the Hercules Constellation In the celestial tap… Constellations
- Herschel, Caroline Caroline Herschel: A Stargazer in Her Own Right Caroline Herschel (1750-1848) … Astronomers
- Herschel, Friedrich Wilhelm (always known as William Herschel) William Herschel: The Man Who Uncovered the Universe Born Friedrich Wilhelm He… Astronomers
- Herschelian Telescope, or “ Front View.” The Herschelian Telescope: A Front-Row Seat to the Cosmos The night sky, a tap… Astronomical Instrumentation
- Herschel, John Frederick William Following in the Footsteps of a Giant: John Herschel and the Exploration of the… Astronomers
- Hertzsprung, Ejnar Ejnar Hertzsprung: Mapping the Stellar Landscape Ejnar Hertzsprung, born in 18… Astronomers
- Hevelius Johannes Hevelius: The Sky-Charting Citizen Scientist Johannes Hevelius, whose… Astronomers
- Hind, John Russell John Russell Hind: A Pioneer of Asteroid Discovery and Stellar Variability Joh… Astronomers
- Hipparchus Hipparchus: The Father of Scientific Astronomy Hipparchus, a Greek astronomer … Astronomers
- Hoffmeister, Cuno Cuno Hoffmeister: A Lifetime Dedicated to the Stars Cuno Hoffmeister, born in … Astronomers
- Homam Homam: A Stellar Nickname with a Celestial Past In the realm of stellar astr… Stellar Astronomy
- 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
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