| Term | Definition | Contributor | Modified |
|---|---|---|---|
| hgj | No definition provided | Naima Sultana | 2025.05.05 |
| hgjh | No definition provided | Naima Sultana | 2025.05.12 |
| HGRTN | This system was, for example, used by the Ulysses mission. +X-axis: vector (Sun-S/C). +Y-axis: cross-product of (heliographic polar axis) and +X-axis. | Ryan McGranaghan | 2023.04.16 |
| HGRTN | Heliocentric Radial Tangential Normalcoordinate system (aka RTN). Typically centered at a spacecraft. Used forIMF and plasma V vectors. The X axis (radial) is set as the primary axis,and is defined as the axis pointing from the spacecraft to the Sun. The Zaxis (tangential) is set as the secondary axis, and is defined as thatportion of the solar North rotational axis which is perpendicular to theprimary axis. The Y axis (normal) is defined as Z cross X. | Ryan McGranaghan | 2023.04.16 |
| Hiarneite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hibbingite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hibernation | No definition provided | Christopher Rauch | 2023.12.01 |
| Hibiscus esculentus | No definition provided | Christopher Rauch | 2023.12.01 |
| Hibonite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hibschite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hickey plot, 1776 | No definition provided | Christopher Rauch | 2023.12.01 |
| Hickory | No definition provided | Christopher Rauch | 2023.12.01 |
| Hicksites | No definition provided | Christopher Rauch | 2023.12.01 |
| Hickson compact group | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hidage | No definition provided | Christopher Rauch | 2023.12.01 |
| Hidalgoite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hidatsa Indians | No definition provided | Christopher Rauch | 2023.12.01 |
| Hidatsa language | No definition provided | Christopher Rauch | 2023.12.01 |
| Hiddenite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Hides and skins | No definition provided | Christopher Rauch | 2023.12.01 |