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| physical object > artifact > observatory | 
| observatory | ||||
| subject | fact | |||
| observatory | is a kind of artifact | ![]()  | 
| has definition a place on earth which has one or more telescopes | ![]()  | |
| has telescope | ![]()  | |
| has altitude | ![]()  | |
| has location | ![]()  | |
| has address | ![]()  | |
| artifact | has creator | ![]()  | 
| has creation date | ![]()  | |
| has purpose | ![]()  | |
| has owner | ![]()  | |
| physical object | has angular momentum | ![]()  | 
| has mass | ![]()  | |
| has velocity | ![]()  | |
| has momentum | ![]()  | |
| has temperature | ![]()  | |
| has volume | ![]()  | |
| has extent | ![]()  | |
| has material | ![]()  | 
Kinds of observatory :