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- Hadley, John John Hadley: Pioneering Astronomer and Innovator of Navigation John Hadley (16… Astronomers
- Hadley’s Sextant Navigating the Stars: The Legacy of Hadley's Sextant The vast expanse of the c… Astronomical Instrumentation
- Hale, George Ellery George Ellery Hale: A Visionary Architect of Modern Astronomy George Ellery Ha… Astronomers
- Hall, Asaph Asaph Hall: Unveiling the Secrets of Mars Asaph Hall, born in 1829 and passing… Astronomers
- Halley, Edmond Edmond Halley: The Man Who Brought Us the Comet Edmond Halley, born in 1656, i… Astronomers
- Halley’s Comet Halley's Comet: A Celestial Spectacle with a 76-Year Cycle Halley's Comet, a c… Solar System Astronomy
- Halley’s Method of Determining the Solar Parallax Unveiling the Sun's Distance: Halley's Method and the Venus Transit The Sun, o… Solar System Astronomy
- Hamal Hamal: The Ram's Head Star Hamal, a name sometimes applied to the star α Ariet… Stellar Astronomy
- Harding, Karl Ludwig Karl Ludwig Harding: The Man Who Discovered Juno Karl Ludwig Harding (1765-183… Astronomers
- Harmonic Circle The Harmonic Circle: A Tool for Unveiling Binary Star Orbits In the realm of s… Stellar Astronomy
- Harmonic Ellipse Unveiling the Hidden Dance: Understanding the Harmonic Ellipse in Binary Stars … Stellar Astronomy
- Haro, Guillermo Guillermo Haro: A Pioneer in Stellar Evolution and Cosmic Clouds Guillermo Har… Astronomers
- Harriot, Thomas Thomas Harriot: The Unsung Hero of Lunar Mapping Thomas Harriot, a name often … Astronomers
- Harrison, John John Harrison: The Man Who Conquered Longitude John Harrison (1693-1776), a se… Astronomers
- Hartmann, Johannes Franz Johannes Franz Hartmann: A Pioneer in Stellar Spectroscopy Johannes Franz Hart… Astronomers
- Harvest Moon The Harvest Moon: A Celestial Beacon for Farmers The Harvest Moon, a captivati… Solar System Astronomy
- Hay, William Thompson The Comedian Who Conquered the Cosmos: Will Hay and his Saturnian Discovery Wh… Astronomers
- Hebe Hebe: A Rocky Wanderer Between Mars and Jupiter Hebe, designated as (3) Juno, … Solar System Astronomy
- Heis, Eduard Eduard Heis: A Keen Eye on the Cosmic Stage Eduard Heis (1806-1877) was a prom… Astronomers
- Heliacal The Dance of Stars and Sun: Understanding Heliacal Rising and Setting In the v… Stellar Astronomy
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