Amateur
- 301
- Orbitron - Satellite Tracking System
- For radio amateur and observing purposes, and used by weather professionals, satellite communication users, astronomers, UFO hobbyists and astrologers.
- 305
- Asteroids
- Includes student project award, hunting, and grants issued presented by Sky and Telescope.
- 306
- Minor Planet
- Dedicated to astronomical imaging and positional data, and includes information on observatories, news, images, star charts, fits data, and shareware.
- 307
- Comet Observation Home Page
- Recent news and observations, ephemerides for current visually observable comets, finder charts and orbital diagrams, images, and information.
- 309
- JUPOS - Database for Object Positions on Jupiter
- Project aimed to collect precise positions of jovian cloud features, to analyze them in drift charts, and to examine if and how their movements change in time.
- 311
- Communications in Mars Observations
- Director's notes, member's activities, gallery, dust storm and predust storm images, and links.
- 314
- Full Moon Calendar
- Provides a lunar calendar and information on the phases of the moon and moon facts.
- 315
- Lunar Prospector
- Designed for a low polar orbit investigation, including mapping of surface composition and possible polar ice deposits, measurements of magnetic and gravity fields, and study of outgassing events.
- 316
- NOVA Online: To the Moon
- Companion to two-hour NOVA special originally broadcast on July 13, 1999 which chronicles the untold science and engineering story of getting there.
- 317
- An Introduction to Green Flashes
- Real phenomena seen at sunrise and sunset when some part suddenly changes color at sunset, from red or orange to green or blue.