| ultramarin marine translations |
| ultramarin.online | ||||
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Greenwich-uurcirkel | projectie van de nulmeridiaan op de hemelbol; |  |
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Greenwicher Stundenkreis | Projektion des Nullmeridians auf die Himmelskugel; | ||
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Greenwich hour circle | projection of the prime meridian on the celestial sphere; | ||
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cercle horaire de Greenwich | |||
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