| Galatea | A moon of Neptune was discovered by the Voyager Imaging Team in July 1989. Galatea is also designated as "Neptune VI" and "S/1989 N4". In Greek mythology, Galatea was one of the Nereids. | |
| Galaxy | A structure consisting of billions of stars, gravitationally bound together. Our galaxy, the Milky Way Galaxy has about a 100 billion stars. | |
| Ganymede | A largest moon of Jupiter and the largest moon in the solar system. Ganymede is larger than the planets Mercury and pluto. Ganymede was discovered by Galileo Galilei on January 11, 1610. Ganymede is also designated as "Jupiter III". In Greek mythology, Ganymede was the cup-bearer of the gods. | |
| Gemini | Gemini (The Twins) is a zodiacal constellation, that is, it lies across the ecliptic, an imaginary line across the sky that the Sun, Moon and all the planets except Pluto seem to move along. The primary Stars are named after the twins Castor and Pollux, who are the sons of Zeus and Leda in Greek mythology. | |
Gibbous Moon  Gibbous Moon |
The shape of the lit portion of the moon or a planetary disk where the lit portion of the disk is more than half the disk surface. The terminator appear convex. | |
| Globular Cluster | Large spherical group of stars bound together by gravity, mostly found in outlying regions of a galaxy. | |
| GOTO | Self-pointing capability in a computerized telescope mount. | |
| Grain Moon | The name of the Full Moon usually in August. Specifically the second Full Moon after the Summer Solstice (June 22 by "The Maine Rule"). Sometimes known as the "Sturgeon Moon" or the "Green Corn Moon." | |
| Grass Moon | The name of the Full Moon usually in April. Specifically the first Full Moon after Ecclesiastical Vernal Equinox (March 21). Sometimes called the "Pink Moon," "Egg Moon," the "Easter Moon" or the "Pascal Moon." | |
| Gravity | The tendency for all matter to be attracted to all other matter. | |
| Green Corn Moon | The name of the Full Moon usually in August. Specifically the second Full Moon after the Summer Solstice (June 22 by "The Maine Rule"). Sometimes known as the "Sturgeon Moon" or the "Grain Moon." | |
| Gregorian Calendar | A revision of the Julian calendar ordered by Pope Gregory XIII on February 24, 1582 via the papal bull Inter gravissimas. to correct cumulating errors which the feast of Easter to drift eariier and earlier in the year. This is the current civil calendar used by most of the world. | |
| Grus | The constellation "The Crane" | |
| The "Stars and Scopes" Glossary was compiled by Peter Ue from various sources on the internet. I tried to correct and edit as much as possible, but I can make no claim or warrenty to the information here. If you find any errors just contact me and I'll try to fix it - Thanks , Peter. |
