| GCVS | General Catalog of the variable stars | Russia | |
| VSNET | Variable star network | Japan | |
| AAVSO | American Association of variable star observers | USA | |
| IBVS | Information Bulletin on variable stars | Hungary | |
| NASA | Nasa's home page | USA | |
| NASA ADC | Nasa Astronomical data center | USA | |
| Astronomy | Astronomy Magazine | USA | |
| Sky Pub. | Sky Publishing | USA | |
| Astropc | Patrick Chevalleys Astronomy Perograms | France | |
| Satallite Tracking | Human made staellite tracking page | Usa | |
| Tubitak | Türkiye Bilimsel ve teknolojik araştırma kurumu | Turkey | |
| Space Resources | Astronomy Resources | USA | |
| ESA | European space agency | Italy | |
| Meduza | Czech Variable star association | Czech Rep. | |
| AVE | Spanish Variable star association | Spain | |
| Autoplot | Lew's MS excel software | USA | |
| AFOEV | France variable star organization | France | |
| BAAVS | BAA's variable star section | United Kingdom | |
| IAU | International Astronomical Union | USA | |
| IMO | International Meteor organization | USA | |
| Regulus | Amateour Astronomy Newsletter | USA | |
| USNO | United States Naval Observatory | USA | |
| Fourmilab | Online sky charts | Switzserland | |
 |
 |