| Lacaille, Nicolas Louis de | Nicolas Louis de Lacaille: Charting the… | Astronomers |
| Lacerta (the Lizard) | Lacerta: The Little Lizard in the North… | Constellations |
| Lady’s Way | A Journey Through the Zodiac: Exploring… | Galactic Astronomy |
| Lagging of Tides | The Lagging Tides: A Celestial Dance of… | Astronomical Inst… |
| Lagrange, Joseph Louis de | The Celestial Architect: Joseph Louis L… | Astronomers |
| Laplace, Pierre Simon | Pierre-Simon Laplace: The Architect of … | Astronomers |
| Lassell, William | William Lassell: A Pioneer in Planetary… | Astronomers |
| Last Quarter of Moon | Last Quarter Moon: A Waning Crescent in… | Cosmology |
| Latitude, Celestial | Celestial Latitude: Charting the Stars … | Galactic Astronomy |
| Latitude, Geocentric | Unlocking the Secrets of the Stars: Lat… | Galactic Astronomy |
| Latitude, Heliocentric | Unraveling the Celestial Tapestry: Lati… | Galactic Astronomy |
| Latitude, Parallel of | Charting the Stars: Latitude, Parallels… | Galactic Astronomy |
| Latitude, Terrestrial | Latitude: A Celestial Compass for Earth… | Galactic Astronomy |
| Latus Rectum, or Parameter | The Latus Rectum: Unveiling the Secrets… | Galactic Astronomy |
| Leap Year | Leap Years: A Stellar Balancing Act Th… | Galactic Astronomy |
| Least Squares, Method of | Unveiling the Secrets of the Stars: The… | Galactic Astronomy |
| Leavitt, Henrietta Swan | Henrietta Swan Leavitt: The Woman Who M… | Astronomers |
| Lemâitre, Georges | Georges Lemaître: The Priest Who Shaped… | Astronomers |
| Lemniscate | The Lemniscate of the Cosmos: Unveiling… | Galactic Astronomy |
| Le Monnier, Pierre Charles | Le Monnier, Pierre Charles: A Stargazer… | Astronomers |
